I would never put an aftermarket bov on my stock 09 wrx, its pointless. Anything that's factory works the best, when your running a stock motor with a stock turbo.

TurboMR2

February 19, 2009

I don't see a point on putting a aftermarket bov on a stock wrx its just a waste of money. If they put a factory diverter valve there its for a reason, so that it works best with factory specs.