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      11-16-2012, 10:34 AM   #3
AlanYoro35i
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Drives: F32 435i M Sport
Join Date: Aug 2010
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If you are talking about catted AR downpipes then it give you 10-15 bhp which you hardly notice. You will feel turbo's spools a little longer but not much difference since you are running sports cat not the catless version.
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