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Discussion Starter · #1 ·
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??
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