Quote:
Originally Posted by pbdm4k
I dont see why this would be a problem if you install these post cat/rear o2 sensor.
so it could be like a free flow cat back.
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-Because the O2 sensors on BMWs also measure impulse speed. If the exhaust is flowing too much faster than expected, the DME starts turning down power. It is VERY irritating! Simulators could be a solution, but I haven't researched them enough to make any recommendations.