• Largest downpipe on the market
• 4 inch cast steel bellmouth design
• Fits Turbo XS external wastegated uppipe
• Includes a pre-welded 02 sensor bung
• Includes all the necessary hardware and gaskets

The Turbo XS downpipe is largest downpipe on the market. The TurboXS downpipe for Subaru WRX and STi features a large 4 inch cast steel bellmouth. From there it tapers to 3 inch stainless steel piping towards the end. It also includes a pre-welded 02 sensor bung for an aftermarket wideband O2 sensor.

Turbo's work best when there is large pressure and temperature differential across the turbine wheel, and having a large free flowing downpipe like the Turbo XS gives you that large pressure and temperature differential. The Turbo XS downpipe fits all 02-07 WRX or STi, and will fit perfectly with Turbo XS external wastegated uppipe.

IF YOU ARE NOT USING A TURBO XS EXHAUST, YOU WILL NEED TO USE THEIR CATBACK ADAPTER PIPE (SOLD SEPARATELY) TO MAKE THIS DOWNPIPE FIT UP TO A 3" CATBACK EXHAUST.

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WRX / STi TurboXS Downpipe & Catback Adapter The Turbo XS downpipe is largest downpipe on the market. The TurboXS downpipe for Subaru WRX and STi features a large 4 inch cast steel bellmouth. From there it tapers to 3 inch stainless steel piping towards the end. It also includes a pre-welded 02 sensor bung for an aftermarket wideband O2 sensor From: $332.00