Thread: AR downpipes, pronounced whistling / hissing noise accelerating at 75+mph?
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      02-04-2012, 07:27 AM   #48
joed1
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Drives: 2009 335xi coupe/2011 X3
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OP, 12/10 first post. I trust you have ruled out any gasket failure (exhaust leak). Have you bought this to a AR installer for a recheck?
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