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Yea I don't like it either...from what I can tell it has to do with the exhaust gases igniting in the exhaust pipes. My best guess is the chambers in the stock mufflers provided a buffer to allow the expanding gases be dampened. With straight pipes, or MBRP, etc. there is nowhere for the expanding gases to go except out the tailpipe at full force.
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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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