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      12-16-2009, 02:18 PM   #6
BimmerRob08
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Drives: 2008 M3, Space Gray
Join Date: Mar 2008
Location: KIKR (ABQ), NM

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I've got the Encore xpipe installed with HFC and it's a noticable difference than stock. But I work around aircraft and engine exhausts allot so I might not be as sensitive to it. But I personnely don't think it's a huge difference, just a bit stronger exhaust smell. No one has complained yet to me so far.