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My Borla makes that noise. It can be described as a rush of air or hissing or something, only happens during load, not during free rev. Also during the initial cold start. Both the Borlas I've had make this noise. I have a 3rd warranty replacement on the way (apparently they redesigned it again). Anyway I did verify some blowby on my exhaust gaskets but I'm not sure if that's 100% the cause of the noise - it could mostly be coming from the fact that the metal is much thinner than stock.
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