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We are proud to introduce the CorkSport 3.5” Turbo Back Exhaust for 2010-2013 Mazdaspeed 3! Featuring a cast stainless bellmouth that feeds mandrel bent stainless piping with v-band connections; the CS 3.5” TBE is the BEST in high-flowing exhaust for your speed. Enjoy faster spool and efficient flow all the way up to ~850WHP. All of this in an exhaust that is surprisingly tame while cruising yet rowdy when you want it! Read on for full details and don’t forget to check out the video for sound clips!
Note: This is a complete Turbo Back Exhaust System from turbo flange to exhaust tip. This is the only way to purchases a CorkSport 3.5” Exhaust System because we wanted a true 3.5” pipe from turbo to tip. You CANNOT purchase the Cat-Back Exhaust alone.
The CorkSport 3.5” Turbo Back Exhaust was developed to be the ultimate exhaust for your MS3. The 3.5” diameter piping and bellmouth design are large enough to efficiently support ~850+WHP. While you could make that power on a 3” exhaust, a 3.5” typically will make the same power on less boost or even make more power with minimal tuning changes. Even on lower horsepower cars, the CS 3.5” exhaust shows benefits to turbo spool time. On a car with a built motor and supporting mods, we’ve seen spool time to 30psi improve by up to 300-500RPM compared to a typical 3” exhaust! This car also held a boost better at higher RPM due to the added flow.
The added flow of the 3.5” CS exhaust also adds some volume to your MS3. By using high flowing straight through resonators, we were able to eliminate drone and unwanted sounds from the exhaust without impacting horsepower levels. We created a system that is surprisingly tame while cruising yet when you hit the throttle on an open road, the CS 3.5” exhaust is rowdy, with comparable volume levels to our existing non-resonated cat back exhaust. The extra-large pipe does offer a unique ultra deep tone that we haven’t heard on most other MS3 exhausts!
With the larger pipe, we wanted to not only provide great fitment but make it easier to deal with your downpipe. By separating the upper and lower sections of the downpipe, we were able to alleviate some of the difficulties when installing a DP on your MS3. The bellmouth can be easily accessed when attaching it to the turbocharger without the pipe section in the way. Plus, we ensured plenty of clearance for sockets and/or wrenches for tightening. You can even leave the bellmouth attached to the turbo in case you need to remove the downpipe or turbo for maintenance! The rest of the exhaust was designed for direct OEM fitment, despite the huge pipe size. The only modification needed is a slight bend to an underbody heatshield!
Starting at the turbocharger, the CS 3.5 inch TBE uses a cast 304 stainless steel bellmouth for strength and reliability. From there back, all piping uses CNC machined V-band flanges TIG welded to mandrel bent 304 stainless piping. CNC machining ensures a leak free seal, TIG welds ensure high strength, and mandrel bends ensure smooth exhaust flow. We control sound using straight through resonators with high quality packing materials. Finally, the exhaust is finished off with polished dual layer tips in 112mm (4.4”) diameter that include a laser engraved CorkSport logo. All combine to make an exhaust that looks, sounds, and performs great and will take all the abuse you can throw at it!
Included with your CS 3.5” exhaust is everything needed for installation. This includes stainless v-band clamps, brand new downpipe mounting studs & lock nuts, and replacement polyurethane exhaust hangers. We include the CS poly hangers to ensure no vibrations or rattles with the tight fitment of the 3.5” exhaust. Finally, the thing we’re most proud of is our custom MLS downpipe gasket included with each kit. We port matched it to the DP bellmouth & CST6 to ensure no flow restrictions whatsoever!
It will take you 6-8 hours to install the Mazdaspeed 3, 3.5 inch Turboback with our installation instructions.
6-8 Hour Install
If the turbo back setup is not recommended for KO4 turbos, what would be the correct path to go before upgrading to a CTS4? I still have a stock turbo. What's the better alternative to this exhaust system if this isn't recommended?
The standard 80mm exhaust will work with the K04.
2010-2013 Mazdaspeed 3
2010-2013 Mazda 3 MPS
2010-2013 Mazdaspeed Axela
Tuning: With the larger 3.5" piping we have found that some IWG (and possibly some EWG setups) will not be able to control boost as well due to the improved flow.
OEM K04 = Possible Mild Boost Spike Not Recommended
CST4 IWG = Possible Boost Creep to ~24psi (auxiliary fueling PI or methanol required) Not Recommended
CST4 EWG = Good (no spike or creep) (CS Manifold and EWG Turbine Housing Tested)
CST5 IWG/EWG = Good (no spike or creep) (CS Manifold and EWG Turbine Housing Tested)
CST6 EWG = Good (no spike or creep) (CS Manifold and EWG Turbine Housing Tested)
ATP Turbo = Not Tested
BNR Turbo = Not Tested
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