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Discussion Starter · #1 ·
So I have 2016 wrx stage 2 with intake and a pro tune. As of yesterday it has started to make whistle when I let off the gas under low boost pressures and moderate cursing. (it might be doing it while under more boost too but my exhaust is so loud I might not be hearing it) I don't seem to be having any issues with hitting target boost either, around 19lbs. My thought is that the factory bpv is starting to fail. Would that make any sense? Any help would be appreciated! Thanks.

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