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  1. Stock 2015 WRX Bov size?

    Subaru WRX General Aftermarket Talk
    Hey all, A while back I bought an old school GReddy Type S blow off valve for my 2015 WRX, not doing much research on whether it would be a simple install or not. It came with a flange that was supposed to be used for welding onto an aluminum pipe so I spoke with one of the guys from ETS asking...