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Subaru Impreza WRX & STI T4 Twin Scroll Turbo Kit
This turbo kit isnt for everyone. It works best on a built motor, and more work to install than a stock location turbo. However – it is our top selling turbo kit, and we snagged the 2016 Unlimited AWD Global Time Attack championship with an off-the-shelf setup.
Full-Race engineers designed this kit to generate the broadest possible power band with huge area under the curve. This is not intended to go 8s in the quarter mile. Optimal performance with fast throttle response, early spool and huge top-end power – while being flexible enough to grow with your future needs. Full-Race recomends using T4 frame turbochargers such as BorgWarner Airwerks, EFR, or Garrett, Turbonetics, etc. The S300SX FMW has proven to be an outstanding high power performer on the EJ25 engine.
Whether you are road racing, drag racing or building a “street weapon” daily driver, the Full-Race Twin Scroll Turbo Kit is adaptable to suit any chassis and application, now including the popular 08+ STI and 05+ Legacy GT and 11+ STI.
Full-Race Subaru Impreza WRX/STI T4 Twin Scroll Turbo Kit Includes:
- Full-Race Subaru WRX/STI Lower Manifold
- Full-Race Subaru WRX/STI T4 Twin Scroll Up-Pipe
- Full-Race Subaru WRX/STI T4 Twin Scroll Downpipe
- Full-Race Subaru WRX/STI T4 Twin Scroll Kit Box
Full-Race Lower Manifold
Full-Race Twin Scroll Up-Pipe
Full-Race Twin Scroll Downpipe
Full-Race Kit Box (Fittings, Hardware, and Lines)
Optional Full-Race Subaru Reverse Mount Intercooler Kit
Optional TiAL MVS Wastegates
Optional TiAL Q Blow Off Valve
Optional High Temperature Coating
“the fact is the BW S300SX FMW is a ridiculously good turbo and absolutely unmatched for the price point. I’ve been trying different setups on my STI since I bought it new back in 2006… I’ve used a few of the FP bolt on turbos (regular green, HTA green, red), I used the ATP35R, Garrett 4088R, had a APS header up-pipe (four of them actually because they kept cracking), a Full-Race 1.5 scroll kit, and a Full-Race complete TS kit (what’s on the car now)… The BW S300SX FMW, by far has out performed any of my previous setups… I have spent a lot of time and money trying to make this car a respectable fast daily driver, and had all but given up before Geoff told me about this new BW turbo…This turbo just flat out kicks butt – good boost threshold, makes great power all they way up to my 8000rpms rev limiter, and the boost recover between shifts is just flat out instantaneous… I’m pretty confident that with E85, this turbo will do over 650whp with even more gains in the mid-range – I admittedly was surprise to see the boost threshold of a 35r and the power of a much larger turbo… On the dyno, we were hitting peak boost of ~29psi and then it would taper to ~27psi at redline, on the street it holds 30psi across the board.” Phil Petraca
- The OEM Subaru triple layer steel gasket is strongly recommended. There are other less expensive options available, but this is the best because it has a built-in crush ring and is steel so it will not deteriorate. The Subaru part number for the exhaust gaskets is PN # 14038 AA 000. Torque properly to factory specifications.
- Fits OEM oil pan only.
- Some chassis may require a small bend to the aluminum A/C line at firewall (most do not).
- Wrap wire loom as it comes out of firewall with heat wrap and pull with zip ties towards shock tower for additional clearance.
- 2000 degree ceramic coated turbine housing is STRONGLY recommended.
- 2000 degree ceramic coated up pipe, downpipe and lower manifold also recommended.
- Heat wrap recommended and will not void warranty.
Full-Race Rotated STI kits require PS hose modifications. *If you dont want to modify the powersteering hose please look at our Subaru Stock location EFR turbo kits
Full-Race 08+ STI kits requires heat protection around a safely secured ECU plug and the installer should relocate the ABS mechanism higher on the strut tower. This allows the 4″ intake tube to fit through. Pics of stock ABS location (and bracket) interfering with 4″ inlet:
For more information and or related questions, feel free to contact us.
- (866) FULLRACE
|Dimensions||10 x 10 x 10 in|
Black Anodized($+150.00), NONE, Standard
2000 Deg. Black ($+150.00), 2000 Deg. Silver ($+150.00), None
BorgWarner 75-70 – Includes 3″ V-Band Mod ($+869.00), BorgWarner 83-75 1.00 AR (~35R) – Includes 3″ V-Band Mod ($+925.15), BorgWarner 91-79 .91 AR (~40R) – Includes 3″ V-Band Mod ($+925.25), BorgWarner S300SX FMW 8375 – Includes 3″ V-Band Mod ($+1,149.00), Garrett GT35R W/ ATP 1.06 HSG ($+1,905.95), Garrett GT4088R 1.06 AR ($+1,597.62), Subaru Reverse Mount Intercooler Kit ($+1,970.00)
NONE, Subaru Reverse Mount Intercooler Kit ($+1,970.00)
02-03 WRX, 04-05 WRX/STI, 05+ Legacy GT, 06-07 WRX/STI, 08+ WRX/STI, 11+ WRX/STI
2000 Deg. Black ($+85.00), 2000 Deg. Silver ($+85.00), None
2000 Deg. Black ($+110.00), 2000 Deg. Silver ($+110.00), None
|Lower Manifold Coating||
2000 Deg Black ($+135.00), 2000 Deg. Silver ($+135.00), None
|TiAL Q BOV||
Black ($+259.99), Blue ($+259.99), Purple ($+259.99), Red ($+259.99), Silver ($+259.99)
(2) MVS Black ($+480.00), (2) MVS Blue ($+480.00), (2) MVS Purple ($+480.00), (2) MVS Red ($+480.00), (2) MVS Silver ($+480.00)