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CST4 Turbo Upgrade - 2006-2013 DISI MZR

Price: $1,099.99
Price in points:  What are Points? 1100 points

Products in package


Experience a boost in performance with our drop-in Mazdaspeed turbocharger. It easily bolts in and replaces your undersized OEM turbo with NO mechanical modifications. The CorkSport turbo supports a range of 250-450* horsepower in your Mazdaspeed. If your Mazdaspeed 3 or Mazdaspeed 6 turbo is worn out or is smoking, you need our turbo. Add the power without the hassle today!

Designed with you in mind, the CorkSport turbo upgrade fits the 2007-2009 and 2010-2013 Mazdaspeed 3 and the 2006-2007 Mazdaspeed 6. No extra modifications are required with our turbo. Nor will you experience the pain of running out for missing parts mid-installation. Our turbocharger comes with all the necessities you need for increased power performance, including:

  • Assembled turbocharger
  • Billet wastegate actuator
  • Custom heatshield
  • Direct fit coolant line
  • All the replacement studs
  • Stainless steel gaskets
  • Oil feed banjo bolt
  • Coolant line copper crush washers
  • And more

Check out our OEM comparison chart after the video for detailed specs! The turbo bolts in, but does require a re-tune of the factory ECU to operate safely (see the notes at the bottom of this page).

CST$ vs K04 Comparison

Easiest installation on the market! Select our installation instructions below for a complete package list. Share your CorkSport experience in the Reviews section above!

Comparison Specs: CorkSport's Mazdaspeed Turbo Upgrade vs. OEM K04

Component Feature CorkSport Performance Design & Advantages OEM K04 Turbocharger
CHRA Bearing System Heavy Duty Journal Bearing With 360 Degree Thrust Collar Standard Journal Bearing With 270 Degree Thrust Collar
Lubrication & Cooling System Oil & Coolant Oil & Coolant
Serviceability 100% Rebuildable Without Replacing the Center Section Housing Not Worth Rebuilding
Balancing Procedure Compressor Wheel Balanced Unknown
Turbine Wheel Balanced Unknown
Assembled CHRA Balanced Unknown
Compressor Wheel Material Fully-Machined Forged Billet T6 Aluminum Alloy Cast Aluminum Alloy
Wheel Design 50.5mm Inducer 55 Trim 6x6 Blade Design With Extended Tip Technology 45mm Inducer 64 Trim 6x6 Blade
Housing Material Cast T6 Aluminum Alloy Cast T6 Aluminum Alloy
Housing Design 0.53 A/R With OEM Size Inlet & Outlet Unknown A/R With OEM Size Inlet & Outlet
Maximum Flowrate 47 lbs/min at Sea Level Not Enough
Turbine Wheel Material Inconel 718 Super Alloy: Extreme Heat Tolerance Unknown
Wheel Design 49mm Exducer 76 Trim High Flow 9-Blade, 21% Lighter Than 12-Blade Design 44.5mm Exducer 79 Trim 12-Blade Design
Housing Material High Silicon Molybdenum: Resistant to Heat Cycling Cracks Cast Iron Alloy
Housing Design Single Scroll 0.66 A/R with OEM Hook Up Points Single Scroll Unknown A/R with OEM Hook Up Points
Wastegate Design Internal Internal Wastegate Design: 34mm Flapper Valve Internal Wastegate Design: 27.5mm Flapper Valve
Actuator Large Diaphram Billet Housing With Adjustable Rod Small Diaphram Stamped Steel Housing Non-Adjustable
Port Size 27mm Port: 25% Larger Than OEM 21.5mm Port
Turbine Outlet Increased Outlet Size Improves Flow Around Wastegate Port Non-Optimized Outlet Restricts Flow Around Wastegate Port
Installation Drop-In Includes OEM-Style Coolant Line, Turbine Gaskets, Studs and Crimp Flange Nuts OEM
Quality Control Balancing Turbo Technics CHRA Balancer up to 250,000 RPM Unknown
Warranty Coverage Limited 1 Year/Unlimited Miles Mazda Powertrain

The CorkSport Advantage

Close up of CorkSport Mazdaspeed3 replacement turbo with logo plate.

Customer-Focused Experience: It is ready for you and your ride. No modifications. No purchasing extra parts. And no hassles that come from other turbochargers available for Mazdaspeeds.

Mazdaspeed replacement turbo billet wheel by CorkSport

Performance Billet Wheel Design: The CorkSport forged billet compressor wheel features extended tip technology that spools quicker and flows 15-20% more than a similar cast wheel.

CorkSport Mazdaspeed turbo upgrade compressor cover.

Cast Compressor Housing: CAD designed to allow the use of the OEM boost control solenoid and factory-sized intakes.

CorkSport Mazdaspeed 3 and 6 replacement turbo turbine housing.

Cast Turbine Housing: Housing is designed from scratch to maintain all OEM locations. Increased A/R for high RPM efficiency and a 12% larger wastegate port size to help with boost control. Manufactured from high silicon molybdenum for enhanced heat tolerance.

CorkSport Mazdaspeed replacement turbo turbine wheel with nine blades.

9-Blade Exhaust Wheel: A lighter, nine-blade wheel spools faster than traditional wheels. Made from Inconel — a nickel-chromium alloy known for heat tolerance — it handles the extra power and flow with ease.

CorkSport Mazdaspeed replacement turbo

Performance CHRA: A triple-balanced center section. The turbine and compressor wheels are balance individually. Next, the assembly is rebalanced to improve the longevity of the CorkSport turbo.

Mazdaspeed Turbo Upgrade Adjustable Wastegate Actuator

Adjustable Wastegate: A CAD designed wastegate allows for a perfect fit and an easy boost control.

Mazdaspeed turbo upgrade hardware

All Hardware Included: Don't spend hundreds of dollars on gaskets and studs when we include everything you need.

Mazdaspeed Turbo Restrictor Pill Comparison Chart

Includes Restrictor Pill: Optimized for the CorkSport turbocharger, the restrictor pill allows you to run an EBCS (electronic boost control solenoid) interrupt mode setup without drilling.

Want to learn even more about the precision engineering that went into the CorkSport Replacement Turbocharger? Click the button for our white paper below.

Mazdaspeed 3 Turbo Upgrade White Paper

Additional Features

  • Compatibility: Looking for the ultimate in Mazdaspeed performance? Pair your turbocharger with our innovative CorkSport Boost Control Solenoid.
  • Designed in the USA: Engineered in Vancouver, Washington, in the Pacific Northwest.
  • Proven Tech: CHRA is a MHI TD05H-18G.
  • CorkSport service and support: Includes a 1-year/unlimited miles limited warranty, full color installation instructions, and all necessary components. We provide knowledgeable and friendly telephone support at 360-260-2675.

Important Notes

*Our Mazdaspeed replacement turbocharger requires supporting parts, fueling and tuning to reach 250-450 horsepower.

The CorkSport turbocharger does require the use of an aftermarket tune with Versatune or Cobb Accessport. Engine damage can occur without the proper tune and the installation of this turbo.

How To Install Your Mazdaspeed Turbo Upgrade

It will take you 4 hours (240 minutes) to install your turbo with our instructions.

4 hour installationrequires skills to install2 year warrantyNo check engine light
Install time                  4/5 Difficulty               1-year warranty       No CEL

how to install an upgraded Mazdaspeed 3 turbo

This is a great turbo once you get it in, but the added hardware is pretty much no good. I had to use some of the hardware from the old turbo as some of the studs and nuts that came with the new turbo,were either crushed or would not tread. Also it in no way goes in as easy as the instructions lead you to believe. They could just sell you the turbo at a lower cost without the hardware.
Ive been running this turbo for about 15k miles. Noticed a decent amount of oil in intake/charge pipe. Further inspection found bad turbo seals. Was a good turbo while it lasted. Not sure if any warranty/rebuild is an option.
Yeah I love it. Since the fueling system cannot support any more flow than the turbo can provide, it was a perfect fit. There really isn't any point in going bigger. It's priced right, Spools fast, sounds great and was easy to install and tune. My only real issue now is traction. Wrong wheel drive certainly has its limits. I like CorkSport products a lot, which is why I chose your BPV to replace my Turbosmart Dual port, damn thing just quit holding pressure. If you are on the fence about getting a bigger turbo, or your stock K04 is smoking, this Turbo is the perfect solution. Thanks for the great parts and awesome customer service!

The Corksport turbo is a great replacement choice for your k04 if you have suffered from a smoky or blown turbo, or just want more reliable power. My turbos blades had been damaged and were making a screaming noise so I needed to replace that.

Corksports turbo feels very much like the k04 but with more kick in the upper middle RPMs. On my fully bolted 2007 Speed3 I am pushing 23psi making 330whp and 350wtq on 94 pump gas. The turbo definitely has more to give and I can easily see it running more boost reliably.

The instructions provided by CS are very detailed with great pictures, and are my go to source for anytime I need to take something apart on my car. I attempted the install myself but had to take the car to my mechanic as the downpipe I have (cpe) had gotten the best of me. This turbo was actually his second CS turbo install that week!

So far I have put 2500km on the turbo and have had no issues. Of course that is not a long time for something to be on a car but it has definitely been an abusive 2500km. Thank you Corksport for the wonderful product and your great customer service!
Hi. I have a 09 mazda 6 mps completely bone stock. Im very interested in purchasing this turbo for my car. My q is, do i have to change internal components (pistons, conrods) to run this turbo effectively? Will this turbo kill the lifespan of my engine internals? Thanks
just installed the corksport turbo,3"intake,and corksport boost controller and just came back from tpg tuning in pa all i can say is wow!! I made 329whp and 352 torque on 20psi. (dont have the 3 bar maf sensor yet would of gone more) this turbo is so much smother than the junk k04 i am extremely happy with my purchase and would recommend this turbo to anyone
perfect alternative to the stock paper weight . dont let the size of this turbo fool you it builds to about 15 pounds really smooth then gets violent to 27 pounds fitment was perfect
I needed to change a smoking stock turbo and decided on this bad boy. I honestly chose it because it was a direct replacement and the price was perfect.

As others have stated, it spools for days and pulls like a pack of rabid dogs gunning for the finish line at the Iditarod.

Had this installed and dyno'd. Gotta say it is a top notch turbo and turned my car into a beast. It spools a bit later than the ko4 but the spool doesn't stop. Plus it whistles like a diesels turbo when spooling. Well worth the money especially since it really does drop right in with out issues. Time for a rear motor mount to get rid of the added torque steer.
Great turbo! The install was not difficult and I was not very mechanically inclined, I think changing breaks is more difficult. The turbo has a nice loud deep turbo noise and I cant get enough of it haha. It also makes the car move! I am currently running it at 21 psi and couldn't be happier the car is so quick I am very glad I went with corksport for the turbo. They are a great company and I had an issue with my points not going through but they fixed it right away. I would highly recommend this turbo to anyone looking to buy.
Hey Guys,

My turbo died. My engine died also a few months ago and I rebuilt it on fully forged internals but in rest my only mods are COBB SRI and Hypertech and BPV.

How will this work if I replace my busted turbo with this one? I need a direct replacement and didn't plan to buy the AP right now.

Thanks, Victor
Looking at the spec list you can tell Corksport did their homework for building the most optimized turbo for this platform. Once you unbox the prize you can see first hand the level of quality in the castings not found in even the big name turbos. The forged billet compressor wheel is a work of art, as is the billet wastegate actuator housing. It's almost too much of a masterpiece to hide deep inside an engine bay.

Installation is about as easy as it can get for a big turbo install, having an included coolant line, new studs and nuts for both the manifold and downpipe, quality gaskets for both sides and provisions for all heat shields but one, which is recreated to work with the new setup. It even retains the factory oil lines and ebcs mount.

But the real truth to its performance happens once it's bolted up and tuned. The only familiarity to any of my previous oil infested, self grenading k04s is that instant spool thanks to the high performance 9-blade turbine wheel. From that point forward it's everything you'd want it to be. The dyno graphs are about as perfect as you could ask for. Peak horsepower just before redline and a flat torque curve that brings a grin to your face driving the car at any throttle level. On just 92 octane I'm putting 350whp on my Genwon and the turbo isn't even breaking a sweat yet. I have far more room to grow with a built block and additional fueling if I ever go down that road. No more k04 flamethrower, no more power drop at 5500rpm. All smiles, all the time. This is the perfect turbo for this platform.

This things spools up quick! Running 17 psi going to about 20psi and it pulls strong. And it’s a lot smoother than the stock k04.
Overall I am very impressed with this turbo, not only does it look great but it performs amazingly! The install was very simple using the provided instructions from Corksport, after the install and the re-tune the performance of my car is night and day compared with the old Ko4. This turbo definitely out performs the BNR in many ways, first and foremost it flows more than the BNR, secondly the turbo comes with gaskets, studs, nuts, coolant line and a nice heat shield which the BNR does not come with for the same price. For me, choosing this turbo over the BNR was an easy choice and I am very pleased with it.
Write a review

How much does the whole unit weight and what are the dimensions of the turbo ?

Asked by Eduardo Sanchez | 11/14/2019, 12:31 PM | 3 answer(s)

I've been reading about boost creep issues in older revision and some boost creep in newer ones, is this something that has been corrected? I also read about issues with turbo seals. has this been corrected also?

Asked by Eliezer Perez | 11/07/2019, 03:41 AM | 1 answer(s)

I show this turbo comes with a free map sensor. Is the free sensor the same as this one also, will i need a extension harness?

Asked by Dylan Aslinger | 08/18/2019, 07:12 AM | 1 answer(s)

How does it compare in spool time vs. K04? Ive seen videos where K04 is way faster in spool time. I prefer quicker spool time with a little more top end.

Asked by Eliezer Perez | 06/12/2019, 06:01 AM | 0 answer(s)

Can i drive the cs turbo without any softwaretune, if i have the corksport map Sensor?

Asked by Alexander Koo | 05/20/2019, 07:11 AM | 1 answer(s)

Was just curious of all necessary supporting mods needed to run this turbo. What’s needed specifically such as hpfp, intake, tune, etc.?

Asked by Addison Oakley | 03/21/2019, 01:22 PM | 1 answer(s)

Will this turbo fit my 2010 Mazda 3 2.5 L Engine Sedan ?

Asked by Jonatthan Sabadlab | 08/16/2018, 12:52 AM | 1 answer(s)

I bought this turbo because my old one is smoking, I have an aftermarket intake but nothing else. Do I absolutely have to have the HpFp internals right away?

Asked by Ellie  | 08/19/2018, 06:11 AM | 1 answer(s)

With all Mazdaspeed6 products; is there any difference with fitment if i put this or any other product from corksport on My 6MPS or are they the same car with a different name?

Asked by Reon Stewart | 09/16/2018, 08:59 PM | 1 answer(s)

Is the corksport turbo smog legal in California?

Asked by Danny | 06/16/2018, 09:39 PM | 0 answer(s)

Will this fit a 2017 mazda

Asked by Alex | 03/10/2018, 04:13 AM | 0 answer(s)

does cobb tunning have a map for this turbo?

Asked by Elvis Vanegas | 12/06/2017, 04:15 PM | 1 answer(s)

If i install this turbo will i still be able to daily my speed3 for a few months until i have enough for a tune or a cobb accesport?

Asked by Elvis Vanegas | 11/24/2017, 06:23 PM | 1 answer(s)

Can I use my CS stg2 intake with this turbo??

Asked by Johanan Navarro | 01/07/2018, 01:02 PM | 1 answer(s)

First question. If I pair this Turbo with a CS EBCS (boost control solenoid) in an interrupt setup, per the EBCS instructions on routing, Will the restrictor pill need to be removed along with the line from wastegate to turbo? Or will it need to be reinstalled (the restrictor pill) somewhere else in the tubing? Wastegate to solenoid perhaps? Second question. If I were to leave it as a bleed setup with the same EBCS does the pill need to stay between the wastegate and turbo or come out? Third question. Which Boost control setup is ideal for this turbo Bleed or Interrupt?

Asked by Justin Pike | 09/10/2017, 06:33 PM | 1 answer(s)

What is the difference in the no cat and catted installation option?

Asked by Damien Newton | 08/26/2017, 08:01 AM | 1 answer(s)

What is the highest PSI that these turbos can run reliably?

Asked by Greg | 08/15/2017, 08:27 AM | 1 answer(s)

Will this fit an 2007 CX-7?

Asked by Steven | 08/14/2017, 02:44 PM | 1 answer(s)

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