Hi there I have noticed my exhaust note changes on and off to a deeper tone on cold start up. it's not changing revs just sounds like it's getting deeper then stops. Some times it does it a few times on and off for the first minute of start up. I have a O2 controller and a fuel mod fitted is this normal?


Time spent without rod in hand is time forever wasted.

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Time spent without rod in hand is time forever wasted.