Want to turn more heads with a pisshhh sounding noise from your boxer enigne?
Well the loudest blow/dump off for a scooby is made from Turbosmart supersonic.This is currenlty the loudest ever bov made from a Subaru Impreza and works with even better with wrx sti models.I heard a Hks sequentiual and Blitz dump valve and they sound great but they are not loud if you compare it with Turbosmart's valve.Buying this valve will cost you around about £180 or $289.43 depending on were you live.
Here is a video that shows the blow valve in action!
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