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      05-04-2012, 05:28 PM   #9
CJ421
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Drives: 2017 F30 340i
Join Date: Feb 2011
Location: Philadelphia, PA

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I personally wouldn't say it's normal; my AR 4" has been on for almost a year and the car has not acted differently. I have a JB4 (map 2) as well. Mine is a manual transmission, not sure if that is related.
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2017 BMW 340i (F30); M Sport, Mineral Gray/Coral Red, 6MT; Full Dinan catback, M Perf. shifter
Past: 2011 335i (E92); M Sport, Le Mans Blue/Black, 6MT