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      07-28-2012, 11:29 PM   #4
Zebra99
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Drives: 2011 335is E93
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I definitely agree with the above. Back pressure is a necessary evil on an NA motor. I say you either put on catless with lower diameter exhaust. Maybe 2.5 all the way back or you cat your current system.

Also, since you're mistake on the rating, you're really only losing 10-15whp.

Sry to hear dude, hope you figure this situation out.
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