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From: Alamosa, Colorado (200 yards from the Rio Grande)
RE: Which BOV?
Your factory Blow Off Valve (surge valve) that came stock on the SRT-4 vents intake pressure back into the turbo's compressor housing. In stock form, it is very hard to hear the "whoosh" or "air brakes sound" when you lift off the gas because the air vents right back in.
An aftermarket BOV like the Mopar, vents the pressurized air to the atmosphere and allows you and anyone else nearby to hear the unique sound....