The TurboXS catback exhaust for your 2015 WRX and STi is one of the first and best modifications you should do to your new Subie.  Uncork...

Front Pipe (J-pipe) with High Flow Catalytic Converter for your 2015 Subaru WRX (W15-FPC).  ?So you want to get more power from your WRX...

If you want performance gains for your 2015+ WRX BUT you want to keep a catalytic converter AND don't feel like dropping a ton of money,...