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CST5 Turbo Upgrade - 2006-2013 DISI MZR

Price: $1,299.99
Price in points:  What are Points? 1300 points

Products in package


Not too big, not too small. ITS JUST RIGHT for YOUR SPEED. Capable of built block power and extremely fast spool times, this turbo can make 500+whp and hit 20psi by 3500-3600rpm. The CorkSport CST5 turbo can be tuned for a more laid-back curve that is stock block safe or pushed to 30+psi for built blocks and auxiliary fueling. No matter what build you have this turbo will be sure to impress.

The CST5 features a MHI Journal Bearing CHRA, 0.82 Turbine A/R and 4” Anti-Surge Compressor Cover

The CST5 turbo will be available in two boost control setups: Internally Wastegated (IWG) & 44mm Externally Wastegated (EWG) w/included EWG elbow pipe & V-band clamp.

Includes a FREE CorkSport 3.5 bar MAP sensor for accurate boost pressure up to 37psi.


The CorkSport Mazdaspeed Advantage
CST5 IWG and EWG Mazdaspeed Performance

Balanced Performance

The CorkSport CST5 is designed with the ideal balance in response and power for the daily driven Mazdaspeed. Just between the CST4 and CST6, the CST5 can reach ~20psi by 3500-3600rpm and carry power to 7300-7500rpm.


Mazdaspeed 3 big turbo CST5 Back

Stock Flange Fitment

Ease of installation and use is key to all CorkSport Performance Turbochargers. The CST5 retains the factory style turbine flanges for a painless installation.

The turbine housing is designed with a 0.82 A/R to balance response and top-end power.


4 inch Mazdaspeed3 big turbo cover

Anti-Surge Compressor

4” anti-surge ported compressor housing is utilized for peak performance operation. The anti-surge porting increase the compressor map width paired with an industry standard 4” inlet to maximize the use of 3.5” and 4” intake system.


Mazdaspeed 6 CHRA Housing for CST5

High Performance CHRA

MHI Journal bearing CHRA housings are used for both the CST4 and CST5 turbochargers for their increased cooling capacity and proven reliability.

High performance journal bearings and a 360 degree high performance thrust bearing is used.

Comparing the compressor and turbine wheels, we have a wheel size ratio of 1:15


Mazdaspeed 3 big turbo Billet Compressor wheel

Billet Compressor

Utilizing the Gen1 GTX71 billet compressor wheel, the CST5 can efficiently support 56 lbs/min flowrate and boost pressures over 30psi.

Speed3 External Wastegate big turbo

High Flow Turbine

Paired with the compressor wheel is an MHI TF06 high flow turbine wheel. This wheel uses a 9-blade design which reduces overall rotating mass and thus improves response and spool.

Mazdaspeed 3 Turbo Wastegate Spring Set

Tunable Wastegate Actuator

The Internal Wastegate Actuator uses a larger diaphragm and piston for improved boost control for the larger CST5.

Also included is an assortment of springs so you can specifically setup you CST5 for your Mazdaspeed.

Mazdaspeed Drop In Turbo Hardware Kit

All Hardware Included

The CST5 comes will all the necessary hardware for installation saves you time and money on gaskets, studs, and the specialty parts.


Mazdaspeed 3 big turbo bolt in EWG Kit

Choose Your Boost Control

Do you want an easy to use Internal Wastegate setup or an External Wastegate setup and screamer pipe? You decide with the CST5!
Internal Wastegate setup includes the 0.82 A/R IWG turbine housing and tunable IWG Actuator.
External Wastegate setup includes the 0.82 A/R EWG turbine housing and V-Band Clamp & Elbow designed for 44mm EWGs. (EWG and Screamer Pipe Not Included) Don’t worry, if you want to change your setup later you can!


Additional Mazdaspeed Features
  • Compatible with: 2006-2013 DISI MZR found in the Mazdaspeed 3, Mazdaspeed 6, & CX-7
  • Designed in America: Designed in Vancouver, Washington, in the Pacific Northwest.
  • CorkSport Service & Support: 1 year limited warranty, full-color installation instructions, all necessary components, and knowledgeable telephone support at (360) 260-2675.

  • Auxiliary fueling required for peak power operation of this turbocharger.
  • EWG variant designed for 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 EWG elbow that is included with the CorkSport EWG Turbocharger. Check the "Fitment Notes" tab for details.

How To Install Your CorkSport CST5 Turbo Upgrade

It will take you five hours to install the CorkSport CST5 Turbo Upgrade with our easy-to-use instructions.

CST5 installation instructions

5 Hour Install Time

5 Hour Install Time

Difficulty: 4/5

4/5 Difficulty

1-Year Warranty

1-Year Warranty



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