Blk95gs
20+ Year Contributor
- 711
- 5
- Apr 18, 2002
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Havre De Grace,
Maryland
I just installed a ported EvoIII 16g turbo, ported EvoIII mani, 650cc injectors, intake, FMIC,3.5" GMAF, Ramchargers MAFT, RNR 2.5" o2 elim. downpipe w/external dump, and a 2.5" cat back on my car. i drove the car with no cat back on, and it made 11 psi with the boost controller off. after i put the cat back on, the wastegate was just stuck open. now it only builds 2-5 psi. what would suddenly cause that crap? all parts were brand new upon install