CST6 Turbo Upgrade - 2006-2013 Mazdaspeed

Corksport SKU: GEN-6-577-99
CST6 Turbo Upgrade - 2006-2013 Mazdaspeed

CST6 Turbo Upgrade - 2006-2013 Mazdaspeed

Corksport SKU: GEN-6-577-99
Regular price $1,499.99 USD

This item is sold out in Winnipeg. However, may be in stock at one of our warehouses! Email us to get an ETA! sales@ossmotorsport.com

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If you’re looking for big power for your Mazdaspeed without the headache of non-OE style fitment, then you have come to the right place. The CorkSport CST6 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 Wastegated (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.


The CorkSport Advantage
Mazdaspeed 3 big turbo

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

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 a 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

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 greater load on the CHRA. We specially modified the Garrett CHRA though to fit with the OEM Mazda oil drain line to simplify your install.

Mazdaspeed 6 Big 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 Mazdaspeed3 Billet Compressor

Billet Compressor:

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

Mazdaspeed6 and Speed 3 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 dumptube so no fab is needed on your CST6 install!

CST6 Mazdaspeed 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 3/6 & 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.

  • 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

Tracking will be sent once it leaves our warehouse.

For Canadian shipments, if the item is at a US address, the item needs to be brought into our Winnipeg warranty prior to shipping out to the destination.

Tracking information will be received once it leaves Winnipeg.

Please note, average turn around time for this is roughly 2 weeks, if the product is in stock.

Absolutely NO refunds/exchanges on special order items. If return of a non special order item is requested, customer must pay shipping and it must be requested within 14 days of purchase. 

Any orders not picked up by the customer within 15 days after notification of arrival becomes property of OSS Motorsport Ltd. no credit or refund will be given.

Customers that remove product(s) from OSS Motorsport will have been deemed to agree with all of the above terms and conditions. All items sold are for Off Road Use Only.

All performance modifications are done at your own risk and may void your warranty.


Unwanted items are subject to a 20% restocking fee, in addition to the return shipping to our warehouse(if applicable). Used items cannot be returned.


All Electronics are final sale!


Please have your mail box or junk mail box checked for status updates.

Shipments, returns & refund

During the payment process, we provide delivery options with different delivery companies with which we have no contractual relationship. We offer commission free this added service so the client can receive its order without having to round trip to our warehouse. If there is any problem with the delivery, it is the consignee responsibility to contact the delivery company he/she dealt with directly. The carrier provide a limited insurance of 100$. If you need more, please contact us prior to purchase as we will get you the quotation for extra insurance from the carrier you will select.

NO return accepted. Exchange upon approval and proof of factory default.

Partial or full refund requests are subject to 5% administrative fees. Refund is immediately issued upon cancellation and a confirmation email is sent. However, depending on the payment method used, it may take one (1) to ten (10) days for the refund to appear in client account.

Special orders are non-refundable.

United States orders may be subject to Custom fees and tax as we ship from Canada. 


Some products may be used for off-road only. Customer is responsible to check with his/her local/state laws and ordinances.

We are not responsible if the client ordered the wrong item, which does not work on its vehicle.

All parts required professional installation, there is no return or exchange if the client does not know how to install it him/herself.

OSS Motorsport is not responsible for defective or damage caused by unprofessional installation or misuse of the product.

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