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      08-01-2011, 04:38 PM   #2
M3 Adjuster
Brigadier General

Drives: 1988 M3 gone .. 1M HERE!!
Join Date: Mar 2008
Location: Dallas, Tx

iTrader: (0)

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 president, Chief Driving Instructor