K&N TYPHOON AIR INTAKE, PRODRIVE CATLESS MID PIPE, PRODRIVE AXLE BACK, PERRIN LIGHT PULLEY.
JUST WITH THESE MODS I RUN 12.9'S IN THE 1/4 MILE ALL DAY LONG.
LOVE WRC & MOTOGP
Sounds and looks proffesional. Not loud ! will free up exhaust flow specially in the WRX's. Cant go wrong ! Not loud at all by adding just axle back, but perfect sound if you purchase the Prodrive catless mid pipe. These two work great !
None. If you want your car to be loud, then I guess this is a weakness for this axle back.
Easy installation. Good first mod, you can upgrade with a catless mid pipe later and a down pipe.
Reset your ECU after any mod.