Invidia HS15SWMDOC 2015-Up Subaru WRX FA 2.0 Manual Catted Down-Pipe with Wideband Fits 2015-Up Subaru WRX FA 2.0 Manual Transmission Catted Down-pipe with Wideband (two OEM Sensor one wideband) 3-Inch Pipe Size Three O2 bungs total