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AR downpipes, pronounced whistling / hissing noise accelerating at 75+mph?
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12-11-2011, 04:07 PM
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805beemer
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Drives: 2008 135i
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doesn't sound normal to me...I had my ar dp's and fmic installed at the same time. But I can only hear the turbos hissing with the windows down at slow speeds. Hope you get it fixed
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