Mazdaspeed 3/6 CST4 Turbocharger Replacement CHRA

The CST4 MHI Journal Bearing CHRA replacement is available as a standalone part to service your turbo upgrade. This is just the CHRA and no other parts are included to service your Mazdaspeed turbocharger.

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 1:21.

Billet Compressor:

Utilizing a custom MHI 18G billet compressor wheel, the CST4 can efficiently support 50 lbs/min flow rate and boost pressures to 30psi. Compared to cast counterparts, modern forge-milled wheels provide higher boost thresholds, improved response, and increased efficiency to get more power from a small package.

High Flow Turbine:

Paired with the compressor wheel is an MHI TD05H high-flow turbine wheel. This wheel uses a 9-blade design which reduces overall rotating mass and thus improves response and spool.

• Vehicle Fitment: CorkSport CST4 Turbochargers Only.
• Designed in America: 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.

• This CHRA only works with the CorkSport CST4 and does not fit the OEM housings or any of the BNR turbochargers.
• You will need a big ass pair of snap ring pliers to change the CHRA. You have been warned.

How To Install Your Mazdaspeed 3 and Mazdaspeed 6 Upgraded Turbocharger

It will take you 5 hours to install the CorkSport Mazdaspeed CST4 with our easy-to-use instructions.

5 Hour Install Time

4/5 Difficulty

1-Year Warranty

No CEL