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      09-07-2011, 01:39 PM   #1
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Drives: E92 M3
Join Date: Sep 2010
Location: Tampa, FL

Posts: 379
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Figure this one out, Weird exhaust note change...

I am FBO with a Cobb AP Stage 1 Tune. I can be just cruising along and suddenly the exhaust note will change (get louder). The car does seem to accelerate a tiny bit as well (hardly noticeable).

Could this just be a fuel mapping issue with the tune, or perhaps the ECU is not getting the correct feedback from the O2 sensors in the downpipes even?

I am out of ideas of what it may be.
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