Let your big turbo build breathe easy with the CorkSport 3.5” Downpipe for Mazdaspeed 3! A cast stainless bellmouth feeds huge 3.5” diameter piping so your speed is free of restriction, at just about any power level. With the size also comes decreased spool times and we even optimized the design so it is just about the easiest downpipe to install on your MS3. Check out more information and pictures down below!
This is the Downpipe Only Kit, designed to connect to performance 3inch or 80mm Cat-Back Exhausts that use the OEM style donut gasket. This will not connect to the CorkSport 3.5” Turbo-Back Exhaust. If you want a FULL 3.5” exhaust then check out the CorkSport 3.5” Turbo Back Exhaust HERE for GEN1 and HERE for GEN2!
You CANNOT buy the CorkSport 3.5” exhaust in Cat-Back Only setup.
The CorkSport 3.5 inch Downpipe is designed to get the best out of your Mazdaspeed. The large cast bellmouth design and huge 3.5” OD piping offers plenty of flow to efficiently support ~850+ WHP. While this power potential may be beyond your goals; in lower power builds (like a built engine and CST5 Turbo) we have seen spool & transient response improvements.
200-400 RPM faster spool could be expected depending on the exhaust setup you are moving from. We’ve seen this on CST5 built setups with manifolds. Smaller frame turbos such as OEM K04, CST4, and BNRs3/4 will see similar results. While larger frame turbos like the CST6 will see great results but are more dependent of the manifold and cylinder head setups.
We know that one of the biggest challenges when upgrading your MS3’s downpipe is the installation itself. We aimed to remedy at least some of the headaches with the CS 3.5” downpipe. By separating the upper and lower sections of the downpipe, all downpipe nuts are now easier to access as you do not have the lower section in the way while tightening. We allowed for easy stud & nut access as well with cutouts designed to fit sockets & wrenches. Finally, should you ever need to remove the downpipe or turbo for maintenance; the bellmouth portion can stay attached at the turbo! Just disconnect the v-band clamp and remove the lower DP section from the exhaust.
The CorkSport 3.5” Downpipe Only Kit is designed to fit an upgraded 3” or 80mm exhaust that uses the OEM style donut gasket for an easy install with your existing pipes.
The CorkSport 3.5” Downpipe is designed to fit an upgraded 3” or 80mm exhaust that uses the OEM style donut gasket for an easy install with your existing pipes. Offered in both catted and non-catted setups. Both are for race use only and are not street legal in areas with emission controls. The catted setup uses a high flow 3-way metallic foil 300cel CAT with a 4 inch outer diameter.
Starting at the turbocharger, the CS 3.5 inch downpipe uses a cast 304 stainless steel bellmouth for strength and reliability. The 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 bend ensure smooth exhaust flow. All combine to make a downpipe that looks, sounds, and performs great that will take just about whatever you can throw at it
Included with your 3.5” downpipe is everything needed for installation. This includes the stainless v-band clamp for the bellmouth to DP connection, brand new downpipe mounting studs & lock nuts, a new donut gasket at the midpipe, and even an O2 sensor harness extension for catted customers. 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 5 hours to install the Speed 3, 3.5 inch Downpipe with our installation instructions.
5 Hour Install Time
2007-2013 Mazdaspeed 3 Hatch
2007-2013 Mazda 3 MPS
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 = CATLESS ONLY: Possible Mild Boost Spike Not Recommended
CST4 IWG = CATLESS ONLY: Possible Boost Creep to ~24psi (auxiliary fueling PI or methanol required) Not Recommended
OEM K04 = CATTED ONLY: Good (no spike or creep) (CS Manifold and EWG Turbine Housing Tested)
CST4 IWG = CATTED ONLY: Good (no spike or creep) (CS Manifold and EWG Turbine Housing Tested)
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