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      12-15-2012, 09:21 PM   #20
MilehighM3's Avatar
Drives: E90 M3
Join Date: May 2011
Location: Colorado Springs

Posts: 2,156
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The Dinan x pipe does not have cats, which may be causing the AFR issue. Too much back pressure for the tune. Those are decent numbers for the altitude, try living even higher than that! Not to mention we only get 91 octane...
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