i have put a one way valve into my vacuum for the o.e dump valve to make the atmoshperic one louder!
all was going good no running issues etc but my light on my dash has started to show up know
by the way this is on a vxr? i know you all do it on mk4 astra etc so is there any reason why i cant do it to a vxr
anyone with a vxr turbo done it