Description
Rebuild A CST4!
The CST4 MHI Journal Bearing CHRA replacement is available as a standalone part to service your CorkSport turbo upgrade. This is a direct CST4 IWG/EWG CHRA replacement only, and DOES NOT include any other parts, hardware, or housings, 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.
Proven By Thousands Of Community Members!
The CST4 Mazdaspeed K04 Upgrade is a perfect fit for the mildly modified Mazdaspeed 3 and Speed 6 using stock fueling up to budget-built engines with FBO and auxiliary fueling. Replace your KO4 Turbo with the easiest and most complete performance turbo for the Mazdaspeed and have room to grow to 450whp capabilities with the CST4.
*Does your buddy have an old CST4 lying around - refresh it and skip rebuilding your smaller KO4 Turbo!
Read The Blog The CorkSport CST4 – The Best Turbo for the Mazdaspeed
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.
- This is a direct CST4 IWG/EWG CHRA replacement only, and DOES NOT include any other parts, hardware, or housings.
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
New features
- Manufacturer
- CorkSport