We are proud to introduce the CorkSport 3.5” Turbo Back Exhaust for 2007-2009 Mazdaspeed 3! We combined a cast stainless bellmouth, mandrel bent stainless piping, v-band connections, and straight-through resonators to ensure 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 goes from livable and tame while cruising to rowdy when you get on 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 Mazdaspeed3 3.5” Turbo Back Exhaust was developed to be the ultimate CorkSport exhaust. The 3.5” diameter piping and bellmouth design are capable of efficiently supporting ~850+WHP. That power level has been made plenty of times on a 3” exhaust, however, a 3.5” exhaust typically will make the same power on less boost or even make more power with minimal tuning changes. For lower horsepower cars, the 3.5” piping shows benefits to turbo spool time. In our testing, on a car with built motor and supporting mods, we’ve seen spool time to 30psi decrease by up to 300-500RPM compared to a typical 3” exhaust! This car also held boost better at higher RPM due to the added flow.
The added flow of the 3.5” CS exhaust also adds a great new sound and 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 livable and enjoyable while cruising yet loud when you hit the skinny pedal. The CS 3.5” exhaust has comparable volume levels to our existing cat back exhaust but, the extra-large pipe offers a unique 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 install your downpipe. By separating the upper and lower sections of the DP, the piping is no longer in the way when tightening the DP bellmouth to the turbo. Plus, we designed the bellmouth to incorporate 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. No modifications are required for installation & we even supply polyurethane hangers to ensure the exhaust stays in position with no rattles or vibrations.
The CS 3.5 inch TBE uses a cast 304 stainless steel bellmouth for long term 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 a polished dual layer tip in 112mm (4.4”) diameter with an engraved CorkSport logo. All combine to make an exhaust that looks, sounds, and performs great that 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 Speed 3, 3.5 inch Turboback with our installation instructions.
6-8 Hour Install
2007-2009 Mazdaspeed 3
2007-2009 Mazda 3 MPS
2007-2009 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