iv got two dump valves for my gto (see pic) there both recirculating valves
the black one is standard (crap)
and the silver one is a piston valve but its dual port so it has a second vent so it 50/50
i dont want turbo lag so i cant decide

can you not pull out the return feed for the air that goes from the DV back into the air line (the bit that makes it recirculating) so it dumps the air into the engine bay therefore making it an atmospheric one, or would confuse the air flow sensor??

I don’t know about the maf
but I don’t want to get turbo lag so I don’t know whether I should use the standard one or not

Stock is normally the best mate TBH!!

If you wanna get rid of the silver one give me a shout!!

ive yoused the silver one but if i change my mind il pm you ok