Oil Catch Can Kit for 2016+ SkyActiv Turbo 2.5L

Skyactiv Turbo OCC Kit

When you think of a performance aftermarket component you typically think of a part that increases the vehicle’s power, but some performance parts don’t. Instead they have a more critical purpose, increasing the reliability of your performance engine and components.  The CorkSport Oil Catch Can Kit (OCC Kit) is just that type of component(s). 

CNC machined Mazda Oil Catch Can

Why is an Oil Catch Can Kit critical for your Mazda?  Despite the huge advancement Gasoline Direct Injection (GDI) technology there are still some downfalls.  Compared to the more conventional port injection fuel systems, GDI is much more prone to engine oil fuel dilution.  This is primarily due GDI injecting directly into the cylinder; in low speed operation and cold starts the fuel simply does not have enough time to fully atomize into a gas before ignition.  This results in some excess fuel seeping past the piston rings into the oil along with any combustion chamber blow by the pistons.  This is fuel dilution. 

OCC catch all the nasty build up from entering your Mazda Skyactiv engine

Here you can see the results of a CorkSport OCC installed for ~3000 miles on a 2018 Mazda 6 2.5T.  This engine only has 500 miles and has an average commute of 15 miles & 20 minutes of mixed traffic and speeds. 

Mazda’s OE design attempts to resolve some of this with a valve cover breather that vents directly into the turbocharger compressor inlet and a PCV (Positive Crankcase Ventilation) valve in the engine block that vents to the intake manifold. 

How the Mazda OCC works

Mazda’s setup depends on the fuel and water vapor inside the crankcase being drawn into the intake manifold and intake system to then be re-ingested by the engine.  This has two major flaws:

  1. The direct crankcase ventilation via the PCV valve only works while cruising (no boost).  Combustion gas blow by will occur most often while in boost under high throttle application when the PCV valve is closed.
  2. This forces the engine to re-ingest dirty air that carries contaminants in the form of fuel and water vapor along with carbon debris.  These containments then build up on the inside of the intake manifold, cylinder head runners, and the intake valves slowly degrading performance over time. 
Carbon build up on a Mazda engine without the catch can

The CorkSport OCC Kit provides you with two major features:

  1. Both the valve cover vent and the PCV valve are drawn from the turbo inlet directly ahead of the turbocharger compressor. Thus both the valve cover and PCV valve have constant vacuum in all driving conditions, both cruising and high throttle application.
  2. The oil catch can itself acts as a “filter” for the vapor and debris that would normally be directly ingested by the engine. The drawn crankcase vapor and debris is separates and collects in the catch can for easy removal during normal oil changes. 

As you saw above, there is a significant amount of vapor and fine debris that is being filtered out of the crankcase air that would have normally been ingested.  As you continue down the path of modifying and demanding more form your Mazda, the need for a OCC System only becomes more and more critical. 

Bolt on Mazda Cx5, Cx9, and Mazda 6 turbo

Front Strut Tower Brace for the 4th Generation Mazda 6

Bolt in STB for the Mazda 6

We’ve heard you asking, we’ve even seen you trying to fit our strut tower brace for the 2014-2018 Mazda 3 onto your 6. We are proud to announce the challenge is over.  We’ve created a new design specifically for the 4th generation Mazda 6 and its available now!

2018-up-Mazda-6-STB

You may have a goal of improved driving experience or you just want a visual improvement to the engine bay.  We are offering both to you. 

The polished aluminum strut bar and powdercoated steel brackets look great under the hood of the Mazda 6 and the added chassis stiffness provides improved handling and driver feedback. 

Bolt in STB for the Mazda 6

Install is a breeze with color step-by-step instructions and included hardware.  If you’re looking to get even more out of your Mazda 6 in those curvy back roads then we suggest a rear swaybar and sport springs to go along with the CorkSport Front Strut Tower Bar. 

This package will really wake up the chassis of the Mazda 6 providing you with a sports car feel from your big sedan. 

2018 and up Mazda 6 lowering springs

Don’t hesitate! Gets your today!

Mazda 6 Turbo Lowering Springs Release!

2018+ Mazda 6 Lowering Springs

We at CorkSport are happy to introduce the Sport Lowering Springs for 2018+ Mazda 6 equipped with the 2.5L turbocharged engine. In our last post, we talked about the height, handling, and quality of our new springs. If you haven’t seen it, check it out HERE. Today we’ll cover how we tested the ride quality and go a step further to talk about damping and natural frequency. I’m going to warn you now; this gets a little bit complicated, but we’re happy to answer any questions you may have.

Spring Damping

Let’s start with a basic example–your car hits a bump which compresses the spring. It “springs” back to its normal length. In a perfect world with no friction or damping, the springs in your suspension would keep bouncing up and down forever, this is called oscillation. Add back in dampening and friction, and the spring will settle out to its normal length pretty quickly. How different strengths of damping affect the “oscillation” can be seen in the graph below.

Spring damping graph
Spring damping example.

The car has hit the bump at the bottom left of the graph. As time goes by, you can see the spring expand and compress and so on. The Greek letter is not important but what is important is the numbers. When it is 0 (black line) the spring compresses and expands over and over to the same height. As the number increases, you can see that the spring returns to its normal length faster until it gets too large and overpowers the spring (dark blue line). For a car, the 0.4 to 1 range is ideal as there is minimal “bouncing” without having too high of damping.

What does all this mean though? Let’s say from the factory the car is in the 0.7 range (orange line). If we went to a drastically stiffer spring, but kept the OEM dampers, we may end up in the 0.2 range (light blue line), which would be uncomfortable due to all the bouncing every time you hit a bump. The CorkSport front and rear spring rates chosen are small enough of a change to fit well with the OEM damping, ensuring no bouncing.

Stock 2018 Mazda 6 and CorkSport Modified Mazda 6
Stock height vs. CorkSport Springs

Natural Frequency Analysis

To go along with this, we did some natural frequency analysis. Natural frequency simplified is how quickly the suspension responds to a bump. Higher the natural frequency, the harsher the ride in a car is. Most “regular” production cars sit in a 1.0-1.6 Hertz (Hz) range for a comfortable ride. Sports cars are usually in the 1.6-2.3Hz range. Full race cars are usually 2.3-3.0 or even higher. An average person will start thinking a ride is stiff/harsh at around 2.0-2.2Hz. Using a special app that ties into the accelerometers of a cell phone we can approximately measure the frequency of a specific suspension setup. With stock suspension on the Mazda 6 2.5T, this yielded ~1.4Hz front and ~1.7Hz rear.

With a stiffer spring, these frequencies will increase, but we wanted to be sure to only increase them slightly, to not severely affect comfort. We went through a few different combinations to get our ideal result. Our final setup ended up at ~1.5Hz front and ~1.85Hz rear. This is enough to notice the suspension feels “sportier” without riding harsh.

2018+ Mazda 6 Roller Shot

There is one other big thing to highlight with frequency. Notice that both the OEM and CorkSport springs have a higher rear natural frequency than front. If your natural frequency front to back is close to equal, the car has a tendency to “pitch” front to back over bumps. Since your rear tires hit the bump slightly later than the fronts, to have a comfortable ride the rear suspension has to “catch up” to the fronts to prevent this pitching back and forth. If a frequency is too much higher in the rear, it can be too fast for the fronts and cause the same pitching issue.

Natural frequency was always on our minds when designing the CS springs and we tested a bunch of different combinations to determine the optimum balance of ride and handling.


That about does it for the Mazda 6 2.5T Sport Lowering Springs. Be sure to let us know if you have any questions-suspension is hard, even for us! Lastly, be sure to share your MZ6T with us by using #CorkSport.

-Daniel @ CorkSport

Shop Now

Performance Exhaust for the 2018+ Mazda6 2.5T

Mazda did a great job bringing a turbocharged engine back to the Mazda 6 (Mazda 3 next please?), but may have done too good of a job of keeping it quiet. Say hello to the CorkSport 80mm Cat Back Exhaust for 2018+ Mazda6 equipped with the turbocharged 2.5L engine. If you’re interested in waking up your SkyActiv-T in both excitement and power, read on as we breakdown the newest CS exhaust.

As with all CorkSport exhausts, the goal of the MZ6 2.5T exhaust is to improve power and sound by improving the flow of the OEM exhaust. We started by increasing the size of the piping from 60mm to 80mm. That is an increase of over three-quarters of an inch to really help your turbocharger breathe better. In addition, the CS exhaust system eliminates the crushed areas present in the OEM exhaust and replaces the restrictive muffler sections with pass-through resonators. These resonators control volume and drone without affecting power output.

All that extra flow does mean a power increase. In our in-house dyno testing, we saw an increase in 5-6WHP just by bolting on the CorkSport  Cat Back Exhaust. Check out the dyno sheet down below to see. This increase came with no tuning changes, no check engine lights, and the only other mod being the CorkSport Short Ram Intake, which was installed for both tests. With the 80mm piping size, this exhaust is ready to support future modifications and would likely show more power gains with proper tuning.

The CorkSport MZ6T exhaust is more than just function. We went through multiple iterations and designs to ensure the best sounding exhaust for your 6. The finished product ups the volume without being annoying to daily drive yet still sounds great when in hard acceleration. We strongly recommend you watch the video below to hear what to expect from this exhaust.

To give a great looking, long-lasting finish to each exhaust, they are manufactured from fully polished 304 stainless steel. To ensure a high quality fitment, all components are precision TIG welded together on jigs made from OEM exhaust components. Lastly as a finishing touch, we use 100mm dual wall exhaust tips. They fill out the bumper cutouts and are extended slightly to give a classy look and enhance the new Mazda 6’s styling.

The CS Mazda 6 Turbo Exhaust comes with all the hardware and gaskets you need for installation, high quality instructions, and CorkSport support for any questions you may have. Pick up a CorkSport MZ6 2.5T Exhaust today and liven up that daily commute.

Mazda 6 Turbo and CX-9 Short Ram Intake

That’s right, it’s time to start making more power on the SkyActiv 2.5T. We are proud to introduce the CorkSport Power Series Short Ram Intake for 2018+ Mazda 6 equipped with the 2.5 Turbo Engine and 2016+ Mazda CX-9 . We replaced the restrictive factory airbox with a free-flowing intake system that was designed to help your turbo breathe significantly better. The SRI offers better performance, sound, and looks in an easy to install package. Read on for full details, and be sure not to miss the sound clips in the video below!

This CorkSport Short Ram Intake was designed specifically to get the best the 2018+ Mazda 6 2.5T and 2016+ Mazda CX9 has to offer. From the precision machined MAF housing to the high flowing filter, each component in the CS system offers an improvement over the stock counterpart while retaining great fit and finish. All mounting hardware, brackets, and clamps are included to make your install quick and painless.

Starting at the OEM turbo inlet pipe, the factory airbox utilizes a ribbed and flexible rubber elbow. While working well enough, the ribs induce significant turbulence into the intake tract. The CorkSport intake replaces this elbow with a smooth flowing silicone elbow. In addition, the silicone is 4-ply reinforced with nylon to eliminate any chance for volume reduction under wide open throttle.

Next comes the MAF sensor housing. The MAF sensor essentially reads the volume air that is entering the engine so the ECU can adjust tuning to suit. Since the OEM unit does a good job here, it was imperative that the CS MAF housing matches to ensure no check engine lights or tuning issues. The CorkSport MAF housing is precision machined from 6061-T6 billet aluminum to match the OEM housing to ensure no CELs, no tuning issues, and great flow.

Finally, the CS SRI uses a performance AEM dry-flow filter. A high-quality filter like this is long-lasting, reliable, and can be washed and reused. It has superior filtration to the OEM filter, while also allowing more airflow into the intake tract.

Now for what you’re all really interested in: power gains. By removing the restrictive OEM airbox and turbulent intake elbow, we were able to pick up 8-12WHP from ~4000RPM out to redline. This power bump comes with no tuning changes and with identical testing conditions. Check out the dyno graph below to see for yourself! Note: the variance in low RPM (2800 and lower) is due to difficulties associated with dyno testing an automatic vehicle.

Freeing up a few extra ponies is great but what you will really notice is the added engine and turbocharger noise. That restrictive airbox does a little bit too good of a job at dampening out all the fun sounds that come with a turbo. We were honestly a little surprised by the flutters, whooshes, and psshh noises that come with the CorkSport SRI. You also gain a little extra engine induction noise under hard acceleration. The extra noise is enough to be fun when you want it but not annoying or distracting when you don’t. Watch the video below to see what it sounds like.

As with most CorkSport products, this SRI kit comes with all the clamps, hardware, and even a support bracket for the MAF housing to ensure you have an easy and quick install.

The CorkSport SRI for 2018+ MZ6 2.5T & 2016+ CX-9is a great modification whether it’s your first or the just the latest on a long list of builds. It provides a noticeable power gain, adds some extra fun to your ride, and will support future mods down the road. Pick up yours today!

Be sure to contact us with any questions you may have, we will be happy to help!