CST5 Turbo Upgrade - 2006-2013 Mazdaspeed DISI 2.3 EWG

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. This it the best K04 turbo upgrade for your Mazdaspeed.

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

The CST5 turbo is 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.

Balanced Performance

The CorkSport CST5 is designed with the ideal balance in response and power for the daily-driven Mazdaspeed 3 or Mazdaspeed 6. Just between the CST4 and CST6, the CST5 can reach ~20psi by 3500-3600rpm and carry power to 7300-7500rpm. Performance is clearly above and beyond the stock K04 turbo.

Stock Flange Fitment

Ease of installation and use is key to all CorkSport Performance Turbochargers. Perfectly designed to replace the K04 Mazdaspeed turbo, 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.

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.

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

Billet Compressor

Utilizing the Gen1 GTX71 billet compressor wheel, the CST5 can efficiently support 56 lbs/min flow rate and boost pressures over 30psi. An improvement over the K04 Mazdaspeed 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.

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.

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.

Coose 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!

• 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.