91a2jettavr6
New member
I'll be adding both an APR downpipe and intake in a week or so. In the meantime, my question is this: will having a stock downpipe prevent boost from building beyond a certain level? If so, what would that level be (roughly)? I set my stage 2 loaded tune to 28 (I do have a HPFP installed) as I am experimenting and my boost gauge, which does work properly, shows 24-25 max at WOT and 20 vacuum at idle, just as it should. Anyway, is the restrictive nature of the stock downpipe preventing boost from building beyond this point? Can I expect an automatic increase once I've installed the aforementioned APR goodies? Thanks guys .