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      02-27-2013, 02:52 PM   #45
smmmurf
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Drives: 2009 M3 Sedan 6MT
Join Date: Feb 2008
Location: Pleasanton, CA

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Quote:
Originally Posted by JAM3S View Post
The decrease in back pressure doesnt effect performance??
The catalytic converters are the main source of backpressure in the stock system
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M3 Sedan - AW/Black - 6MT - no moonroof - no folding seats - RAC RG63 - clear bra by Omega Werks