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Like I said before, I might BARELY have a hiss sound, but you really have to be listening for it. Any chance you can try to get a video of the sound it's making (in-car)? That might help with diagnosing the hiss. At a minimum I would be able to tell you if it's the sound I sometimes get.
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2010 1SS/RS - CGM/Gray Interior - M6 (SOLD) Kooks 1 7/8" headers, Solo Mach-X, Vararam.
2012 2LS - Black A6 (SOLD)
2016 1SS Summit White A8
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