Mazdaspeed CST5 Turbo Upgrade Combo Kit with Exhaust Manifold

About The CST5 + Exhaust Manifold Combo

Save with the ultimate Turbo Combo Kit for your Mazdaspeed. We've combined two of our best products, the CST5 & the Exhaust Manifold, including a block off plate, to give you massive power gains for your Mazdaspeed!

Those aiming for +500 will enjoy the cost savings in this exclusive package tailored to the boost enthusiast. Choose a turbo with either an internal or external wastegate for the performance that most suits your needs. Those choosing an EWG Turbo will receive a dumptube for their exhaust manifold (+$100). Also included is the block-off plate to eliminate any unused external wastegate ports in your manifold or turbine housing. Your smiles and bank account can thank us later.

CorkSport CST5 Turbo

CorkSport CST5 Front better than the K04 BNR S5

Looking for the perfect balance? The CorkSport CST5 turbo is just right for your speed! This turbocharger offers built block power with lightning-fast spool times, capable of producing over 500whp and hitting 20psi by 3500-3600rpm. Whether you want a relaxed, stock block-safe tune or aim to push it to 30+psi for built blocks with auxiliary fueling, this turbo is designed to impress. It's the ultimate K04 turbo upgrade for your Mazdaspeed.

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About The CST5

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.

CST5 IWG and EWG Performance Precision Turbocharger

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.

CHRA Housing for CST5 improves Mazdaspeed

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 set up your CST5 for your Mazdaspeed.

Mazdaspeed Drop In Turbo Hardware Kit replaces the K04

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

Select the setup that works for you with either an External or Internal Wastegate. The IWG setup includes the 0.82 A/R IWG turbine housing and turnable IWG Actuator. The External Wategate also includes the 0.82 A/R EWG turbine housing and V-Band Clamp & Elbow designed for 44mm EWGs.

Mazdaspeed Exhaust Manifold

Experience unmatched performance, reliability, and sound with this exhaust manifold for your Mazdaspeed 3. The exhaust manifold combined with CST5 offers better airflow to help you turbo perform at its best. Combined with the Stock Mazda Flange , the manifold allows you to switch it to another flange style without the need to replace the entire unit. Made from 304 stainless steel, it features no welded flanges or connections, reducing the risk of cracking. Each flange surface is precision-machined for perfect flatness. Enjoy CorkSport performance at its best with the exhaust manifold with the CST5!

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CorkSport Modular Exhaust Manifold for Mazdaspeed 3 & Mazdaspeed 6

Power:

30-40whp gains over an XS Power V3 and faster spooling. This is the result of a well designed, high flow exhaust manifold. Power over the entire curve results in better drive ability and faster times at the track.

CAD Designed:

Each component is CAD designed and validated on car for fitment and performance. Three components: the manifold, flange elbow, and dumptube come together to create the most complete exhaust manifold kit available.

Runner Design:

The CorkSport exhaust manifold design provides improved airflow from its smooth radius bends. The CS manifold accomplishes this through its tubular design with 1.59-inch diameter runners and smooth bends as opposed to the sharp bends of the OEM and other aftermarket manifolds. This is a superior improvement to the 1.41-inch runners in the XS Power V3. These efficiencies provide a smooth flow of air resulting in improved performance of your Mazdaspeed!

High Flow:

Using a combination of computer-aided flow simulations and flow bench testing, the CorkSport Exhaust Manifold was optimized to enhance peak flow capacity and overall performance. Flow bench testing at 28 inches of H2O demonstrated an average CFM flow improvement of 45% over OEM and 33% over the XS Power V3.

Bullet Collector:

The CorkSport manifold features a shallow 16-degree angle collector with a defined "bullet" point to enhance flow efficiency into the turbine, boosting peak flow and power. With individual runner lengths ranging from 10.50 to 12.40 inches, it improves flow balance while preserving the distinctive Mazdaspeed exhaust note.

Dumptube:

With the unique location of the EWG we developed a custom fit 2-piece dumptube that makes installation easy. You can add this optional dumptube and avoid the high cost and time to have a custom dumptube fabricated. Designed to work with most typical downpipe and turbo setups.

Manufacturing:

With the high heat and pressure demands put on the exhaust manifold; material and strength are critical. The CorkSport manifold is investment cast from 304 stainless steel with 0.50in (13mm) thick flanges and 0.20in (5mm) thick runner walls. This manifold is beefy so it can handle the high power high heat reliably.

Block Off Plate

The CorkSport block off valve is an ideal solution for eliminating unnecessary EWG ports or Turbo housing opening. Whether you've chosen the IWG or EWG, the plate will close the necessary opening for the best performance for your Mazdaspeed.

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About The Block Off Plate

Function Focused:

The CorkSport EWG Cap will easily block off any unneeded or unused external wastegate port in your manifold or turbine housing. We took all critical design dimensions directly from a Tial MV-R 44mm wastegate so you can be confident you will have a perfect fit with no leaks.

Materials & Manufacturing:

Each CS EWG block off is precision machined from 303 stainless steel for great fitment, corrosion resistance, and strength. Included with every cap is a stainless steel v-band clamp so install is simple and you don’t need to go hunting for the correct clamp!

Auxiliary fueling is required for the peak power operation of the CST5.
EWG flanges designed for Tial 44mm or equivalent external wastegates.
External wastegate is NOT included in this package.
Some downpipes may need relocation of the primary O2 sensor location for manifold installation.
Some downpipes may not work with the optional dump tube.
Optional dump tube is for EWG installation on the manifold port.
Provided firewall heat shield does not work with Mazdaspeed 6 and RHD Mazdaspeed 3 Models
Compatible with TMIC with modification to the rear mounting bracket and without the use of the manifold-mounted EWG.
EWG cap fits on turbo and manifold EWG ports. Ensure cap is centered on wastegate port and tighten supplied clamp to 8-12ft-lbs.
CST5 Warranty is 1-year, while the Exhaust Manifold carries a 2-year warranty

Compatible with: 2006-2013 DISI MZR found in the Mazdaspeed 3, Mazdaspeed 6
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.