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.