I recently replaced stock pipe with a 3" downpipe on my Supra. I was pushing 15psi before and now its down to 9psi. My wastegate usually screams when I hit boost and now its real quiet. Can a change of downpipe cause this or is it something else?? Do you guys usually turn up your boost to compensate for the downpipe install??
Downpipe cause boost level to go down??
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