All New Mazdaspeed Aluminum Coolant and Power Steering Fluid Tanks

For years, you’ve asked for them, and they’re finally here! 

Introducing the CorkSport Aluminum Coolant and Power Steering Fluid Tank for the First Generation Mazdaspeed3 (2007-2009). Although we’ve had a 2010-2013 Mazdaspeed 3 coolant tank, it’s about time we added these tanks to line up.

2007-20096 Mazdaspeed 3 Engine mods with CorkSport products

Let’s face it, the first-gen Mazdaspeed3 platform is aging, and with that age comes ugly, yellow plastic tanks. We’ve even seen tanks crack and fail, causing coolant leaks, headaches, and eye sores for owners.  It’s time we changed that.

CorkSport has developed a solution in the form of an aluminum replacement for these tired plastic tanks that fit and function just like OEM! Our tanks also come coated in a beautiful black powder coat that will look right at home with any color in any engine bay. Our tanks are robust and will stand the test of time for years to come. 

But why aluminum? Why do we even have a tank, to begin with? What does it do?Let’s start by going over how a cooling system works.

TW: It’s about to get a little nerdy!

Understanding Heat Transfer in Cooling Systems

Think about a hot summer’s day. You’re sweating from a hard day of wrenching on the Mazda in the garage and desperately need a cool down, so you place a cold, wet, refreshing towel around your neck. Initially, when you place that cool towel around your neck, you only feel the cold in one place: around your neck. But pretty soon, you feel the cold spread throughout your body and begin cooling down.

This feeling, however, is misleading as there is no such thing as “cold.” There is only heat and a lack of heat. What’s happening is the heat that you feel on your body is being transferred into the cool towel, and the blood that passes through your neck is cooled as a result. As this blood with less heat (i.e., “cooled”) circulates around your body, you feel the effect of that towel all throughout until all of your blood is cooled, and you begin to feel better! You’ll notice after some time that the towel is no longer cool because it has absorbed the heat from your body and the surrounding air. Remember: heat moves from hot to cold and wants to spread until an equilibrium is met. 

How Automotive Cooling Systems Work

Automotive cooling systems work on the same principle. Replace that towel with a radiator, your blood with automotive coolant, and the engine as a heat source, and now you have an automotive cooling system! As the cold coolant passes through the engine, it absorbs the heat generated by the combustion cycle and friction in the cylinders. Some of this hot coolant is then passed through your HVAC system, where some of this heat can be used to heat the cabin (this is how your heater works), and the rest is passed to the radiator for cooling. Once cooled by moving air, it is then passed again into the engine, where it works to cool it down. Then the cycle continues. This is the same basis of how Turbo front mount intercoolers operate. For more information on these systems, check out our Front Mount Intercoolers.

So where does the tank come in?

Naturally, as things heat up, they expand. Coolant is no exception to this rule, and this is usually combated with an expansion tank to capture any excess volume. What makes the MazdaSpeed 3 cooling system unique is that the expansion tank is incorporated into the main flow path of the coolant, with the expansion volume built into the reservoir design. This design of combining the expansion tank with a reservoir simplifies the system without the need for additional tanks or hoses. This can also be compared visually with the fill point of the cooling system. On most vehicles, it is located on top of the radiator, but on the Speed3, it is located on the tank directly.  This means that the tank itself is pressurized when the system is hot, which introduces a challenge with material selection.

Mazdaspeed’s Need For A Better Tank  

Since the OEM tank is made of plastic, it is more vulnerable to degradation over time. Once the tank has deteriorated enough, it cannot withstand the pressure changes and high-temperature cycles of the coolant system. It will eventually fail, leading to many owners complaining of cracks and leaks. The TIG welded aluminum construction and powder coating of our tanks mean that they are substantially more resilient than the OEM tanks and will last for years to come. 

2007-2009 Mazdaspeed 3 aluminum coolant tank

Power Steering Tank

The 2007-2009 Mazdaspeed 3 power steering tank is much simpler as its only function is to hold fluid, and the system is only slightly pressurized, meaning no expansion volume has to be built into the tank design and the temperatures are much lower. However, the OEM tank is still made of the same ugly plastic as the coolant tank and has the same disadvantages. While this tank does not see the same failure rate as the coolant tank, we decided to take the opportunity anyway to fully complete the look of the engine bay and provide our customers with a comprehensive solution to replace all of the aging plastic tanks to improve the appearance of the engine bay vastly. 

mazdaspeed3 aftermarket power steering tank

Fitment and Design

We understand that universal tanks are such a pain. We have experienced this with some of our cars and have had to design and fabricate custom brackets to make them fit. This is a headache, not to mention having to cut or move OEM hoses or custom-make our own. Retaining OEM fit and function is the easiest and most effective design for installation, and that is exactly what we have done for our tanks!

First Gen 2007-2009 Mazdaspeed 3 Aluminum Tank compared with OEM tank

If you want to purchase one (or both) of our Aluminum Tanks for your Mazdaspeed 3, today is the day! 


-Quintin, CS engineering

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How To Build A 900 Mazdaspeed 3 AWD Swap – Rocker Arm Suspension (Part 4)

Welcome to part 4 of the Mazdaspeed3 AWD Swap! If you missed the previous posts, you can catch the Intro, (Part 2), and Part 3.   This blog will cover the rear suspension design, specifically the rocker arms, and how we came to the size, shape, and overall design.  This will get technical with numbers, angles, and CAD models.

Before we get into the technical jargon, let’s cover the “what” with rocker arm suspension.  

Mazdaspeed 3 AWD Swap Rocker Arm Suspension
Mazdaspeed 3 AWD Swap Rocker Arm Suspension

Let’s break down this diagram as it is 100% not OEM for the Mazdaspeed 3:

  • Rocker Arm:  This is the keystone of the suspension design and does all the work.  The rocker arm connects the push rod and the damper to transfer suspension force at a different angle.  The rocker arms can also go by a few names: rocker arm, bell crank, cantilever, and pivot arm, to name a few.  
  • Push Rod: This is a simple rod with spherical rod ends on each end.  This connects the OEM suspension to the rocker arm.  The push rod is in a similar location as the OEM suspension. 
  • Suspension Mounting Bracket: This is the mounting point for the push rod to the OEM suspension trailing arm. This must be added because the OEM damper mount is below the now-new axle shaft. 
  • Coilover/Damper: This is an off-the-shelf damper that can have a coil spring installed on it.  It features independent rebound and compression damping adjustability.  
  • Cross Member: This is the cross member that is welded between the chassis shock towers in the car to support the new rocker arm suspension.  

Here you can see the design tack welded in the car.  This should help you understand how the design fits and is used in the car itself.

Mazdaspeed AWD Suspension Corss Member Tacked
Mazdaspeed AWD Suspension Corss Member Tacked
Mazdaspeed AWD Suspension Push Rod Mount
Mazdaspeed AWD Suspension Push Rod Mount

Now that we have a basic understanding of this rocker arm-style suspension let’s get into some more details!

First, let’s talk about suspension and the forces they deal with.   Gravity pushes you and your car down to the ground, and road imperfections (bumps, potholes, unlevel surfaces) try to push you and your car up/down/all around while driving.  If vehicles did not have suspension and instead the wheels were rigidly attached to the vehicle chassis, we would have all sorts of issues.  Comfort, control, and tractions are the big concerns, amongst many others.

The suspension’s job is to soak up and move with many road imperfections like bumps, potholes, and unlevel surfaces.  Every time your tire goes over a bump or pothole, it moves up or down, resulting in a force transferred into the suspension.

Check out this quick illustration to see the rocker arm suspension in motion:

As the tire moves up/down, you can see that the rocker arm pivots and transfers that motion into the coilover/damper.

Now let’s break down those forces a bit more.  The rocker arm allows us to change the angle of the forces transferred to a new angle that is easier for us to deal with. Instead of being required to have a coilover/damper in a vertical suspension down around the tire (like OEM), I can now change the angle so I can put the coilover/damper in a position that is much easier to deal with. 

Rocker Arm Suspension Mazdaspeed  Swap Forces
Rocker Arm Suspension Mazdaspeed Swap Forces

The rocker arm has two major features about it. 

  1. The angle change of transferred forces, as we just discussed.  This is mainly to help with “positioning” the suspension components. 
  2. The rocker arm lengths allow us to define the “motion ratio” of the suspension.  Looking at the diagram, you can see a blue line and a green line.  These effective rocker arm lengths affect the suspension and result in a motion ratio.  
    1. The resulting ratio is 1:0.7 meaning the damper compresses 70% of the amount that the wheel moves up/down.
    2. The wheel/tire has a maximum range of 5.55 inches of travel, while the damper has a maximum travel of 3.875 inches.  

Designing the rocker arm with this 1:0.7 motion ratio allowed me to use a smaller, lighter damper design with limited travel and still get the desired wheel suspension travel I needed.  We use a stiffer spring to compensate for the extra leverage of the motion ratio.  

Motion ratios in suspension are common.  For example, the Mazdaspeed 3 suspension has a unique motion ratio in the front (1:0.98) and rear (1:0.71) from our calculations.  These numbers are typical of the style of suspension found in many commuter cars these days.  

Now that we understand the forces and the intent with the rocker am…we have to design its shape and size to do the job.  Angles are the tricky parts of the rocker arm design.  Defining the angles (and thus shape) comes down to understanding the push rod input angles and the desired damper output angles while in motion. 

Rocker Arm Suspension Mazdaspeed AWD Swap Angles
Rocker Arm Suspension Mazdaspeed AWD Swap Angles

When we say “angles,” we are talking about the red arrows in the above diagram.  These red arrows are the angles between the rocker arm and the push rod, as well as the rocker arm and the damper.  Ideally, these angles are always 90 degrees through the entire motion you see in the GIF, but that is not physically possible, so we had to find the correct balance of angles while in motion.  

A whole lot of math encompasses this, but the upcoming diagrams will help break it down to a very understandable level for everyone!  We are breaking it down to the three major suspension travel points: droop, bump and ride height.  

First, we are going to look at the angles for the push rod in Bump, Ride Height, and Droop. 

  • Bump is when the suspension is fully compressed.
  • Ride Height is when the car is sitting stationary (static). 
  • Droop is when the suspension is fully decompressed.  Image your car sitting on jack stands with the tires hanging in the air. 
Mazdaspeed 3 AWD Rocker Arm Angle Bump Pushrod
Mazdaspeed 3 AWD Rocker Arm Angle Bump Pushrod

In full bump, the push rod angle to the rocker arm decreases to 67 degrees which is 23 degrees off the “ideal” 90. 

Mazdaspeed 3 AWD Rocker Arm Angle Ride Height Pushrod
Mazdaspeed 3 AWD Rocker Arm Angle Ride Height Pushrod

Then looking at ride height as the suspension moves downward from full bump.  The damper-to-rocker arm angle decreases to 82 degrees which is 8 degrees off the “ideal” 90.

Mazdaspeed 3 AWD Rocker Arm Angle Droop Push Rod
Mazdaspeed 3 AWD Rocker Arm Angle Droop Push Rod

Lastly, with the suspension traveling to full droop.  The push rod to rocker arm angle increases to 117.5 degrees which is 27.5 degrees off the “ideal” 90. 

What does this mean?   This is great, actually!  Ride height is where the suspension will function most of the time, and that is only 5 degrees off the ideal 90-degree angle.  When the car is launched in a drag race, the suspension is going to compress, and that angle will decrease, passing through the ideal 90-degree angle and further.  This is precisely the balance we are looking for with the rocker arm design.  To keep it functioning most of the time as close to 90 degrees as possible.

Ok, let’s look at the angles from the damper side of the rocker arm. 

Mazdaspeed 3 AWD Rocker Arm Angle Bump Damper
Mazdaspeed 3 AWD Rocker Arm Angle Bump Damper

In full bump, the damper angle to the rocker arm increases to 111.5 degrees which is 21.5 degrees off the “ideal” 90. 

Mazdaspeed 3 AWD Rocker Arm Angle Ride Height Damper
Mazdaspeed 3 AWD Rocker Arm Angle Ride Height Damper

Then looking at ride height as the suspension moves downward from the full bump.  The damper-to-rocker arm angle decreases to 82 degrees which is 8 degrees off the “ideal” 90.

Mazdaspeed 3 AWD Rocker Angle Droop Damper
Mazdaspeed 3 AWD Rocker Angle Droop Damper

With the suspension traveling to full droop, the damper-to-rocker arm angle decreases to 62 degrees which is 28 degrees off the “ideal” 90. 

Again we have the damper near the “ideal” 90-degree angle at ride height and then pass through the 90-degree angle zone when the suspension compresses at launch.  Again, the balanced angles we are trying to design for so the suspension function in the “ideal” angle range most of the time.  

Why are the angles so important?  The further you get from the “ideal” 90-degree angle, the more non-linear the suspension acts.  When the suspension acts in a linear function, it is tunable and predictable to drive.  If it is non-linear, then it makes tuning and use much more difficult…this results in inconsistent launching and driving, which is not good in a racing environment.

Mazdaspeed AWD Swap Racecar Suspension
Mazdaspeed AWD Swap Racecar Suspension

This seems like a lot of work…why do it? 

A few reasons, really: 

  • Moving to the rocker arm design gave me a lot of control over how I set up my Mazdaspeed for racing
  • It also gave me the ability to use readily available off-the-shelf dampers.  This allowed me to get double adjustable dampers (rebound and compressor) for a very cost-effective price. 
  • The CX7 AWD swap rear axle shafts did not allow me to use the OEM dampers anyways. 
  • This design moves more of the suspension component’s weight to “sprung mass” which is better. 
  • I love the challenge of designing a suspension system like this, and this was a great opportunity!

Before we wrap things up, note the rocker arms are 6061-T6 billet and are massive!  We knew they were big, but it didn’t really sink in until we saw them firsthand.  

Rocker Arm Size Comparison
Rocker Arm Size Comparison
Rocker Arm Size Comparison 2
Rocker Arm Size Comparison 2

Alright, that wraps up the rocker arm suspension design, a huge novelty for the build.  There are plenty more huge milestones to overcome, and those are coming up in this multi-part blog series!

I hope you are enjoying this series about the AWD Swap Mazdaspeed3, stay tuned for more blogs to come!

You can also find updates on my IG @halfmilespeed3, the CorkSport 7th Gear Membership, and on

Thanks for tuning in!

-Barett @ CS

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1st Gen Mazdaspeed 3 Carbon Fiber Spoiler

Are you looking for an exterior mod that will freshen up the look of your first gen Mazdaspeed 3? Well if that’s the case then the Carbon Fiber Spoiler is the perfect part to install on your build. The Carbon Fiber Spoiler retains the OEM look with the much-appreciated addition of carbon fiber. Keep on reading below for more info on the carbon spoiler.

2x2 carbon weave Mazdaspeed3 Rear spoiler wing

Since the Carbon Fiber spoiler is based off of the factory Mazda piece, installation is a breeze and requires no drilling or other modifications to the hatch. We have also pinned the third brake light so that it can reuse the OEM connector with no modification to the harness needed! The Carbon Spoiler also comes with all the necessary hardware to install the spoiler so you can be back on the road in no time. Fitment with other add-on parts such as spoiler extensions or gurney flaps should work with the OEM style shape, however, we have not tested it. The same goes for GEN1 Mazda 3, the CF spoiler should fit, however, you may have a different 3rd brake light setup and/or have additional holes from the smaller Mazda 3 spoiler

Following the OEM MPS 3 design the top is carbon fiber with the bottom being a black gel coat

The Mazdaspeed Spoiler features a fiberglass base that is then topped off with a layer of carbon fiber on the top side of the spoiler. The underside of the spoiler is finished in gloss black and the whole thing is then coated with a UV-resistant epoxy resin to provide a mirror-like finish and the necessary protection from the elements. The two halves come together on the rear edge so there is a small seam, however, once installed, the seam all but disappears!

1st gen MS3 look of the stock spoiler but in a carbon fiber

If the CS Carbon Fiber Spoiler is a mod that you would like to add to your build, then head over and check out the product page for additional photos! Also, feel free to contact us with any questions you might have.

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Mazdaspeed 3 Carbon Fiber Spoiler

Mazdaspeed 3 Carbon Fiber Spoiler

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Mazdaspeed 3 Lowering Springs – V2.0

Speed3 Lowering Springs

CorkSport is proud to announce the new and improved Version 2.0 Lowering Springs for the 2007 – 2013 Mazdaspeed 3.  While the changes are subtle, it never hurts to go back and refine a product that is so well loved by the community

When designing performance lowering springs we want to find the right balance in performance, comfort, and style.  When done right performance springs can make a huge improvement in the vehicle’s overall driving experience.  That is our goal at CorkSport HQ.

The CorkSport V2.0 springs are very similar to the V1.0 with a ride height drop of approximately 1.1” front and 1.2” rear.  This is a fairly aggressive drop, but does cooperate with the stock struts after a bit of bump stop trimming.  That is all clearly laid out step-by-step in the included installation instructions.

Now ride height isn’t everything.  While it looks great, it also needs to perform great.  The CorkSport Sport Springs have specific spring rates so that they perform and feel great for the spirited and daily driven Mazdaspeed 3. 

Up front the spring rate is a linear 3.5K and the rear is a linear 4.5K.   We specifically design the springs with a higher rear spring rate to help the vehicle understeer vs oversteer characteristics and maintain a proper suspension frequency so your Speed feel solid and planted through the curves and over road imperfections.

Overall, the car is going to feel more lively and connected to the road, giving you more feedback and control to enjoy your Mazdaspeed 3.  

You probably also notice a new color!  Yes, our new V2.0 are now blue via a durable and corrosion resistant powder coat finish.  

Thanks for checking out the new CorkSport Lowering Springs for the Mazdaspeed 3.  If you have any questions you connect with us via Facebook, Email or give us a call; we’d love to help.

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Mazdaspeed 3 Port Injection Fuel Kit

Its 2021, you survived 2020 and finally got those last goodies installed on your Mazdaspeed 3…you’re finally fully bolted.  It’s been about 6 months and now you want more, but your Tuner keeps telling you you are out of fuel. What the Hell does that mean!?

Let me tell what that means and let me show you the solution via the BEST Port Injection Fuel Kit for your Mazdaspeed 3 or MPS 3.  If you know this is the kit for you don’t wait any longer (Link to ALL THE FUEL), but I do invite you to check out the great information below. 

Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Say no to “out of fuel” and say yes to enough fuel to support 750+WHP!  But first let’s take a step back to understand the basics. 

Why is your Mazdaspeed 3 “out of fuel”?

The Mazdaspeed 3 and 6 use early technology for direct injection injectors which sadly do not have an aftermarket replacement and reach their flow capacity limit quickly.  This basically puts a limit on the OEM fuel systems horsepower capacity.  From what we have seen firsthand and in the community; the limit is around 360-390whp depending on the performance parts on the engine and the fuel used.  The only current solution is to add a port injection system with either 2 extra or 4 extra injectors.  We’ll talk more about that. 

Mazdaspeed 3 8th Port Auxiliary Fuel Kit

What is an auxiliary port injection fuel system? – This is a kit that adds (does not replace) port style fuel injectors to the intake manifold so that you can increase the total fueling capacity of your Mazdaspeed or MPS.  There are a few ways this can be done and all have been done in the Mazdaspeed Community. 

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2 extra or 4 extra injectors (aka 6th Port or 8th Port Injection)

While the CorkSport Port Injection Fuel Kit is designed for 4 extra injectors (8th Port Kit); there are options in the community that only use 2 extra injectors (6th Port Kit).   CorkSport believes the 8th Port Injection kit is the superior setup because it has higher capacity, is more reliable and safer for the engine.

With an 8th Port Kit there is an extra injector on each runner of the intake manifold spraying directly into that one and only runner.  With a 6th Port Kit there are two extra injectors spraying directly ahead of the throttle body and then depending on the flow distribution of the intake manifold to disperse the fuel to each runner and thus cylinder.

Return vs Returnless Setups

This is another option for Port Injection Fuel Kits in the community.  While both have their place, the CorkSport 8th Port Fuel Kit uses a “return” style setup because again it has higher capacity, is more reliable and safer for the engine because it is easier to tune for.

In a “return” style setup the fuel pressure for the extra injectors increase as boost pressure increases keeping a consistent fuel flow rate per injector duty cycle which provides the higher capacity and much more consistent tuning.  While the “returnless” style setup just plumbs the extra injectors into the OEM fuel feed to the HPFP.  The fuel pressure does not increase with boost pressure and therefore the capacity is lower, around 500-550WHP.

Integrated vs Standalone Fuel System

Lastly is the consideration of how the Port Injection Injectors are fueled.  This can come from the OEM fuel tank or from a completely separate fuel tank in the vehicle.  Unlike the bullets points above, this is not really a “one is better than the other”, but more of “what suits the needs of your vehicle and uses”. 

Integrated Setup

As the name implies this means the Port Injection Fuel Kit sources its fuel from the OEM tank and in-tank pump.  This can actually be done a couple ways 1) via the “returnless” setup as mentioned above but that has its issues or 2) via a surge tank that is mounted in the engine bay or cabin…which has some concerns.

The surge tank setup is a very common “racecar” setup and for good reason.  It handles high G load corning, acceleration, and braking great and also fuels the entire car, not just the port injection system.  However the cost is usually much higher and requires relocation of other engine bay components so you can mount the surge tank. Along with that you can only use one fuel for the entire system so if your car needs a special high octane fuel then you have to use it at all times during operation, whether cruising or full power.

Standalone Setup

In contrary this is a completely separate fuel source via a separate tank.  This can be a really great option for the enthusiast that does some spirited driving, maybe some events here and there, but also daily drives their Mazdaspeed 3.  How is this the case?

With a completely separate fuel cell for the port injection system you can run the exotic race gas/ethanol in the port injection tank and run normal cheap pump gas in the OEM tank.  When you daily drive/cruise you only use the pump gas in the OEM tank and when you want power the port injection kicks in with the high octane fuel.  It’s a win/win, especially if you do not have ethanol close by and have to special order the exotic fuel like we do here in the PNW.  However this does mean you need a 2nd fuel tank for the port injection which can be a pain, BUT CorkSport has that covered in this complete kit

Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Ok let’s recap on where the CorkSport Port Injection Kit for Mazdaspeed 3 fits in:

  • 4 Extra Injectors aka 8th Port Fuel Injection Kit – one injector per runner for more precise fueling
  • Return Style Setup – Fuel pressure rising with boost pressure for more capacity and precision
  • Standalone Tank – Cheap pump gas for daily driving and high octane fuel for port injection power in the secondary fuel cell

I don’t know about you, but this sounds like you can have your cake and eat it to!


Image Credit: Shift Sector Coalinga 2020

Let’s look at the components that make up the CorkSport Port Injection Fuel Kit.  What’s in the Box:

CorkSport Fender Mounted Fuel Cell

This is a huge element of what makes the CorkSport Port Injection Fuel Kit great.  This fuel cell is custom CAD designed specifically for your GEN1 and GEN2 Mazdaspeed 3 to fit hidden under the headlight behind the bumper cover.  At 2.6 gallons capacity you don’t need to refill the fuel cell often and there is an integrated level sensor to remind you when you are at 0.8 gallons.  No in-cab tanks and smells. 

Mazdaspeed 3 Fender Mounted Auxiliary Fuel Cell

Quantum Fuel Pump

  • A 380LPH inline fuel pump is used.  This is a Bosch 044 style pump that has the flow capacity needed and is e85 safe.
Mazdaspeed 3 8th Port Auxiliary Fuel Kit

DeatschWerks Fuel Filters

  • Two fuel filters are used in the system for complete filtration.  A pre-pump 100 micron filter filters the fuel flowing from the tank to the pump, therefore protection the pump from debris.  A post-pump 10 micron filter filters the fuel even more before entering the fuel injectors, therefore protecting the fuel injectors from very small particulates.  Both filters use a dual stage filtration design that incorporates a magnet and a stainless steel mesh media.
Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Spec’d Length 6AN Fuel Lines

  • No headaches and ready to go! Like our Mazdaspeed high pressure fuel line, the included fuel lines are the CorkSport Fuel Lines are spec’d to length and fully assembled ready to use.  The lines are PTFE lined with stainless steel braiding and a hytrel coating for a sleek finish and protection against abrasion.  All fittings minus on 150deg fitting are permanently crimped and sealed.
Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Fuel Pressure Regulator

  • An AEM fuel pressure regulator is used for this return style setup.  This provides easy adjustment and setup of the fuel rail pressure with the included Fuel Lab Analog Pressure Gauge
Mazdaspeed 3 8th Port Auxiliary Fuel Kit


  • Too further simplify, a 30amp relay kit is provided.  Relays are a critical component in setting up a port injection fuel system.  This allows you to safely and reliably provide power and control to the fuel pump. With that a Hobbs Switch is also provided, this acts as a trigger for the relay to apply power to the fuel pump when a set boost pressure is met.  Example: when you reach 4psi the Hobbs Switch will signal the relay to apply power to the fuel pump.  This is a great setup for daily driven cars because you only turn on the pump when needed vs running at all times.  It greatly helps the life of your pump.
Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Misc Hardware

  • Lastly is all the misc hardware and brackets to get this into your speed.  We’ve got this handled and clearly show the install process with the online color step-by-step instructions.
Mazdaspeed 3 8th Port Auxiliary Fuel Kit

Alright that’s what’s in the box for the CorkSport Port Injection Kit; now let’s talk about the other required items.  There are 2-3 critical items needed to get your port injection kit up and running.  

Port Injection Controller

  • The OEM ECU and Cobb/Versatuner tuning options cannot control the extra 4x injectors in the kit so you will need a separate controller and software for this.  There is a simple and proven option with the Split Second Additional Injector Controller AIC1.  It comes with a ready to run harness for EV6 injectors and the harness integration for power, signal and control are very simple.  Check it out here and add it to your CorkSport Port Injection Kit for a one stop shop.
Split Second Injector Controller AIC1-V4H EV6 for Auxiliary Fuel System


  • You will need 4x injectors for the CorkSport 8th Port Fuel Kit.  The injectors need to have 14mm o-rings top and bottom and the length of 34mm or 48mm (if using the CorkSport intake manifold).  To use with the Split Second Additional Injector Controller AIC1; you will want the EV6 connection style. For capacity we recommend at least 1000cc/mm.  To cover all these requirements just use the Injector Dynamics ID1050x.  They are proven and reliable, you can grab a set right here with the CorkSport Port Injection Kit.
Injector Dynamics 1050x Port Injectors for Auxiliary Fuel System


  • While this is not required for operation, it is highly recommended.  The N2MB Racing WOT Box allows you to change the type of Redline and Launch Control cut to a safer method.  OEM will deactivate the injectors for this vs the WOT Box deactivates the spark plugs.  This is much safer for your engine, especially with running a port injection fuel kit.  With this you can also Flat Foot Shift which is faster and way too much fun. (Insert Fireball Emoji Here)

Why doesn’t the CorkSport Port Injection Fuel Kit include these items? 

That’s a good question and we have a good reason.  Originally the kit was going to, but we asked the community how they would want the kit and the answers surprised us.  A lot of people wanted the kit minus the Controller and the Injectors because they already had those items.  So we pulled those out of the kit as solo items you can choose to add if needed.   

Installing this kit into your Mazdaspeed 3 is a day project with some buddies.  Bank on 6+ hours due to the wiring (its always tedious, but important to do right). Read the installation instructions before starting the install so you are ready with all the needed tools and supplies for wiring. 

Mazdaspeed 3 8th Port Auxiliary Fuel Kit

I do want to note that like any project that involves wiring, there will be some wiring required for the install and the extra wiring and connection you decide you need are not included in the CorkSport kit.  Every car is different and how each person wants to get things wired up is different.  There is also some very minimal drilling required to install the tank mounting brackets. 


I hope you found this blog helpful and informative not just to learn about the CorkSport Port Injection Fuel Kit, but to also learn about the other setups and options you can choose from.  I hope this helps you decide what is best for your car and goals.  Give us a call if you have any questions, we’d be happy to help. 

Barett @ CS

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