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Strange sound for a backfire. My manual 335 backfired only if I was going WOT and shifted near redline. Sounded more like a loud pop or mini explosion where as the F10 sounds like deep sounding fart lol. I was looking it up and seems like all the Audi/VW with the DSG transmission has a similar sound during a upshift too.
Sounds as if the exhaust goes from positive pressure to negative pressure (vacuum) for a split second during the upshift.
Alan
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