Stock blow off vavle
#4
It should be right on the side of the turbo housing - round thingy with a vacuum line. Its job is to vent the boost back into the exhaust when you go off throttle to reduce strain on the turbo. Many after market BOVs vent into the atmosphere, thus the tell tale "woosh" sound. there's a diaphram inside that can tear and leak boost - repair kits are $20 or so.
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