Subaru EJ20 / EJ25 AirWerks Twin Scroll T4 EWG Turbo Kit

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Subaru EJ20 / EJ25 AirWerks Twin Scroll T4 EWG Turbo Kit

Not legal for use on pollution controlled motor vehicles in the United States Learn more
This policy only applies to installers and/or users who are in the United States. Customers who reside in other countries should act in accordance with their local laws and regulations. This product is for racing competition only and is not legal for use on highway or street vehicles, or other non-racing competition off road vehicles. Some Full Race Motorsports upgrades may solely be used on vehicles in sanctioned competitions which may never be used upon a public road or highway, unless permitted by specific regulatory exemptions (such as a CARB E.O.). For state specific details please visit the following website: http://www.semasan.com/emissions It is the responsibility of the installer and/or user of the product to ensure that it is used in compliance with all applicable laws and regulations. If a product was purchased in error, do not install and/or use it. The purchaser must arrange to return the product(s) for a refund.

Subaru EJ20/EJ25 AirWerks Twin Scroll AirWerks T4 EWG Turbo Kit

This turbo kit isn't 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 Unlimited AWD Global Time Attack championship with an off-the-shelf setup. Full-Race engineers designed this kit to generate the broadest possible powerband with huge area under the curve. This is not intended to go 8s in the quarter-mile (but it can). 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 recommends using T4 frame turbochargers such as BorgWarner Airwerks, EFR, or Garrett, Precision, etc. The S300SX-E has proven to be an outstanding high power performer on the EJ25 engine. Whether you are road racing or drag racing, 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 Turbocharger

BorgWarner S200SX 75-70
BorgWarner S300SX 83-75


BorgWarner S300SX 91-79


Optional Full-Race Subaru Reverse Mount Intercooler Kit

Note: Currently only available for the 2004-2007 WRX/STI

Black Anodized

Optional TiAL MVS Wastegates

Optional TiAL Q Blow Off Valve

Optional High Temperature Coating


2011+ STI:

GR Chassis 08-10 WRX/STI, shown with BorgWarner Twin Scroll S300SX FMW Turbo:

GD Chassis 04-07 WRX/STI, shown with BorgWarner Twin Scroll EFR 7670 Internal WG Turbo

GD Chassis 04-07 WRX/STI, shown with Garrett Twin Scroll GT40R Turbo:

GD Chassis 04-07 WRX/STI, shown with Garrett Twin Scroll GT35R Turbo:

1. 08+ Requires ABS bracket modification to slide ABS module up higher on the shock tower.  This allows for additional space to fit oversized intake pipe and IWG actuator brackets.
2. 02-07 Verify proper clearance of brake proportioning valve lines around the passenger side shock tower when using IWG turbos.
3. Rotated Subaru manifold / up pipes require rotated power steering hose modification. or rotated specific hose
4. Lower Manifold is Not Compatible With 2.0L Oil Pan. Requires 2.5L Oil Pan and Oil Pick Up.

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Sort ByTurbo Kits
Product NameSubaru EJ20 / EJ25 AirWerks Twin Scroll T4 EWG Turbo Kit
BrandFull Race
BrandsFull Race
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