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      04-26-2010, 12:20 PM   #11
alpina527
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Drives: 2008 E92 M3 DCT JZB/FR
Join Date: Jan 2010
Location: London, England

Posts: 638
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The rasp stems from the design of the exhaust ports and valves. Some exhausts will almost nulify the rasp, but it's still there whatever exhaust you fit
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