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CST6 Turbo Upgrade - 2006-2013 Mazdaspeed

Price: $1,499.99
Price in points: What are Points?1500 points
CST6 Mazdaspeed Turbo With  Free 4.5 BAR MAP sensor

Products in package

If you’re looking for big power for your Mazdaspeed 3 & Mazdaspeed 6 without the headache of non-OE style fitment, then you have come to the right place. The CorkSport CST6 Turbo owns the Mazdaspeed Stock Flange Turbine Record at 684whp all while using stock flange components.

Years of R&D have allowed us to design a high-performance turbocharger that can respond quickly, support 600+whp, and perform with stock-style turbine flanges. The CST6 features a Garrett CHRA with a Ceramic Dual Ball Bearing Cartridge for improved response and durability for high-boost applications. Testing has pushed the CST6 to 38psi maxing out an auxiliary fuel system flowing 40gph of methanol.

The CST6 features a 0.82 turbine A/R and 4” anti-surge compressor cover to support the balanced turbine & compressor wheel sizing. This design provides ~20psi by 3800-3900rpm and top-end power that can support 8000rpm. The total power under the curve generated creates a fun and powerful setup.

The CST6 Turbo is available in Externally Wastegate (EWG) setup only and does include the necessary EWG installation elbow pipe & V-band clamp. We also offer a direct-fit dump tube that you save $10 on when purchased with a CST6!

The included CorkSport 4.5Bar MAP sensor is designed to offer accurate and near-instantaneous readings to ensure your car is staying safe. Boost pressure readings are accurate all the way out around 48psi while response time for both pressure and temperature is mere 2 milliseconds. The CS 4.5Bar MAP Sensor uses a custom injection molded body that mimics the OEM MAP sensor. This means a quick 15-30 minute plug-and-play install with no need for custom wiring or expensive adapter harnesses.

Mazdaspeed 3 Big Turbo the CST6 k04 bnr precision

The CorkSport Advantage
Mazdaspeed 3 big turbok04 bnr precision

High Performance Focused

The CorkSport CST6 is designed to provide big power potential without the need for a custom turbine flange. It has proven to make mid 500WHP on a “moderate” 26-28psi or be pushed to its limit and make 684WHP at 38-40psi. Don’t think this means poor spool characteristics though as the CST6 makes 20psi by 3800-3900RPM!

Mazdaspeed Performance Big Turbo Housing

Optimized Turbine Housing

The CST6 uses 0.82 A/R turbine housing in EWG setup only with an optimized scroll design to maximize power potential of the stock Mazda flange. These features offer great spool characteristics for a turbo of this size without impacting maximum power potential. Best of all, it fits exactly where your OEM turbo did!

Mazdaspeed High HP big Turbo for BNR k04 precision Performance Turbo

Anti-Surge Compressor Cover

To go with the high-performance turbine housing is a 4” inlet compressor cover with anti-surge ports. A 4” inlet was chosen to remove any choke points in the system when used with 3.5” or 4” intake while the anti-surge ports increase the compressor map width for peak performance. Again it maintains OEM fitment so you do not have to modify your existing parts.

Mazdaspeed 6 Big Turbo CST6 Best BNR k04 precision  Turbo PT5931

Ball Bearing CHRA

The CST6 uses a tried and true dual ceramic ball bearing Garrett CHRA. We went ball-bearing with the CST6 to increase durability, especially since the large wheels and high boost levels cause a greater load on the CHRA. We specially modified the Garrett CHRA though to fit with the OEM Mazda oil drain line to simplify your installation.

Mazdaspeed 6 Big Performance Turbo

Proven Wheel Combo

Moving the air in the CST6 is again a tried and true combo: the Garrett GTX3576R wheels. Featuring a billet 11-blade compressor wheel rated at 64 lb/min and a 10-blade turbine wheel, the CST6 spools impressively fast, making 20psi by 3800-3900RPM.

CST6 Turbo Mazdaspeed 3 Billet Compressor BNR k04 precision

Billet Compressor:

Utilizing the Gen1 GTX76 billet compressor wheel, the CST6 can efficiently support 64 lbs/min flowrate and boost pressures to 40psi.

Mazdaspeed 6 and Mazdaspeed 3 BNR k04 precision  Turbo Turbine

High Flow Turbine

Paired with the compressor wheel is a Garrett GT35 turbine wheel. This wheel uses a 10-blade design which reduces overall rotating mass and thus improves response and spool.

EWG Turbo for Mazdaspeed 3, beats the BNR S6

Designed for EWG

In testing it became clear that an internal wastegate setup simply wouldn’t cut it for the CST6. So we perfected the CST6 with an EWG housing for the best in boost control. Each CST6 comes with the elbow and clamp to fit a Tial 44mm (or equivalent) wastegate. If you want to further simplify your install, be sure to pick up the optional CS direct fit dump tube so no fab is needed on your CST6 install!

CST6 Turbo Mazdaspeed BNR k04 precision Hardware Kit

Hardware and Gaskets Included

Each CST6 comes with new gaskets, turbine studs, turbine nuts, new banjo bolts with crush washers, and the coolant lines you need for installation.

Additional Features
  • Vehicle Fitment: 2006-2013 DISI MZR found in the Mazdaspeed 3, Mazdaspeed 6, & CX-7
  • Developed in America: Designed, tested, and validated in Vancouver, Washington, in the Pacific Northwest.
  • CorkSport Service & Support:Receive a 1-year warranty, full-color installation instructions, all of the needed installation hardware, and knowledgeable telephone installation support.

advisory notice
  • Auxiliary fueling required for peak power operation of this turbocharger.
  • EWG designed for Tial 44mm or equivalent external wastegates.
  • External wastegate is NOT included with turbo.
  • EWG dumptube/screamer pipe is NOT included with turbo.
  • Some aftermarket and all OEM downpipes will NOT clear the elbow that is included with the CorkSport EWG Turbocharger. Check the “Fitment Notes” tab for details.

Check Out the CST6 Testing Blog!

Why the BNR S6 Turbo is not as good as the CorkSport CST6

How To Install Your CorkSport CST6 Turbo Upgrade

It will take you five hours to install the CorkSport CST6 Turbo Upgrade with our easy-to-use instructions.

5 Hour Install Time

5 Hour Install Time

Difficulty: 4/5

4/5 Difficulty

1-Year Warranty

1-Year Warranty



BNR S6 Turbo Instructions

I’ve been running this turbo for roughly 3 years now from stock block, to stock block w/ PI, to fully built motor with PI. It’s not an ideal choice for stock block but I planned to go built and this turbo fit my hp goals perfectly. I have loved every minute with this turbo!

Spool time was better than I expected with it being a larger frame turbo. I made 600whp on the dot on just 36 psi in super hot weather. After 3 years of use, the shaft play is hardly even noticeable giving me the confidence that this turbo will last a couple more seasons. The bolt on ability is amazing as well with all the provided lines and oem fitment! Can’t recommend this turbo enough whether you’re looking for 550hp or all the way up to 650+.
The CST6 does not disappoint, very impressed. With a built motor and supporting bolt ons/fueling the CST6 exceeded my goal of 600hp with ease.
Great turbo for us stock flange guys! I made 610 on this turbo with a very basic set up! If you're looking for great power but don't want to have to spend $$$$'s on new manifold and downpipe this is the way to go!
Write a review

I haven't built the motor yet but am debating on putting this turbo with the stock internals. Would it still be efficient to go with this option on stock internals or should I just stick with the CST5?

Asked by Evan | 01/19/2023, 10:25 PM | 1 answer(s)

I am debating on this or the CST5. I am looking for 550ish AWHP. I have 8th port etc. I will daily drive it. Is this ok for daily or does it spool to late? What is the size comparison? GTX3582?

Asked by Joshua Scutt | 01/18/2021, 04:02 PM | 1 answer(s)
Mazda performance parts financing is available with CorkSport

Looking to finance your parts purchase and want to get 6 months NO interest on any purchase over $199? Click on the image above for more details.

Some aftermarket downpipes will NOT clear the EWG elbow that is included with the CorkSport EWG Turbocharger.
If the downpipe is not listed here then it has not been test fitted with a CorkSport EWG Turbocharger.

Mazdaspeed 6 Fitment:
CorkSport Catted Downpipe - Confirmed
CorkSport Non-Catted Downpipe - Confirmed

Mazdaspeed 3 Fitment:
CorkSport Catted Downpipe - Confirmed
CorkSport Non-Catted Downpipe - Confirmed
Cobb Catted Downpipe - Confirmed
Depo Racing Non-Catted Downpipe - Confirmed
XS Power Non-Catted Downpipe - Confirmed
Manzo/Ebay Non-Catted Downpipe - Does NOT fit. Will require custom EWG elbow and dumptube
CPe Non-Catted Downpipe - Confirmed
CPe Catted Downpipe - Confirmed