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Subaru EJ20 / EJ25 Twin Scroll IWG Turbo Kit

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Subaru Impreza WRX / STi EJ20 / EJ25 Twinscroll EFR Internal WG 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: 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 Impreza WRX / STi Twin Scroll EFR Internal WG Turbo Kit

This kit isn't for everyone.  It works best on a built motor, and is more work to install than a stock location turbo. However - if you demand optimal performance with fast throttle response, early spool, and strong top-end power - this is how to get there.  IWG option benefits those who dont want the scream and expense of external WG's. One of our all time top-selling turbo kits, 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 and retain the conveneince and benefits of an internal WG canister. 

Full-Race Subaru Twinscroll IWG Turbo Kit Includes:

  • Full-Race Subaru WRX/STi T4 EFR Twin Scroll Lower Manifold
  • Full-Race Subaru WRX/STi T4 EFR Twin Scroll Up-Pipe
  • Full-Race Subaru WRX/STi T4 EFR Twin Scroll 3" Downpipe
  • Full-Race Subaru WRX/STi T4 EFR Twin Scroll Kit Box

Full-Race Upgradeable Options:

Full-Race Subaru WRX/STi Twin Scroll Lower Manifold

Optional Heat Coating

2000 Degree Black and Titanium (Silver)

Full-Race Subaru WRX/STi T4 EFR Twin Scroll Up-Pipe

Full-Race Subaru WRX/STi T4 EFR Twin Scroll 3" Downpipe


T4 EFR Turbo Options: EFR 7163, EFR 7064, EFR 7670, EFR 8374, EFR 9174, EFR 9180
BorgWarner EFR 7670 0.92 A/R IWG T4
BorgWarner EFR 8474 0.92 A/R IWG T4

Note: Full-Race Rotated STI kits require PS hose modifications

*If you dont want to modify the power steering hose please look at our Subaru Stock location EFR turbo kits

Note: Lower Manifold is Not Compatible With 2.0L Oil Pan. Requires 2.5L Oil Pan and Pick Up

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Sort ByTurbo Kits
Product NameSubaru EJ20 / EJ25 Twin Scroll IWG Turbo Kit
BrandFull Race
BrandsFull Race
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