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      07-27-2010, 10:02 AM   #26
simonlam168
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Drives: E93-M3 F10-M5
Join Date: Apr 2009
Location: Hong Kong

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Most aftermarket exhaust lose in the low end range but gain in the higher end...haha...
If you need some back pressure in the exhaust at low rpms for improved low end power, just change the X-pipe and keep the stock muffler.
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