Hi - and welcome.
I have only been in one, and I would say its giot a raspy little exhaust.
If you think its blowing somewhere, get a rag and apply pressure on the tailpipe (almost blocking it!) and see if you can hear noise getting louder from anywhere else on the exhaust system.
If the back box is leaking, which has been known, for example, you will certainly hear an increase in noise.
David
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