How to install an STi Downpipe
Adding an aftermarket downpipe to a Subaru WRX STi is one of the EASIEST ways to increase STi horsepower and torque.! The stock STi downpipe is very restrictive! By removing the super restrictive stock...
STi Downpipe / STi Engine Mods / STi Videos
by money · Published September 1, 2013 · Last modified March 13, 2020
Adding an aftermarket downpipe to a Subaru WRX STi is one of the EASIEST ways to increase STi horsepower and torque.! The stock STi downpipe is very restrictive! By removing the super restrictive stock...
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