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      08-01-2011, 04:38 PM   #2
M3 Adjuster
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Drives: 1M, X1 M Sport, E46 325ic
Join Date: Mar 2008
Location: Dallas, Tx

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if your last car was a bmw that was normally aspirated, for the most part the motors are designed to have a certain amount of backpressure... so... yes.. you will get more noise but less backpressure, less torque.. and less power.... In essence.. just because it works on a american car.... doesn't mean that a less restrictive exhaust is the key for a BMW.

a simple trip to the dyno likely would have confirmed your concerns on your previous car.

I would recommend going to a dyno now and get a baseline..... and then you will know in the future if your mods are helping or hurting..
Lone Star BMW CCA Chapter Ex-president (retired 2017) , Chief Driving Instructor - LIFETIME Member # 119366
If you don't STAND for something.. you'll FALL for anything
Past: 1991 BMW E30 M3 street car ; 1988 BMW E30 M3 track car