Unplugging from the trunk didn't seem to do much for me. If I'm going uphill slightly and hovering around 2,000 RPM I will very noticeably hear what I assume to be my exhaust flap open, because it deepens and burbles like hell, but resets after only a few seconds - any idea how to make it permanent? Couldn't seem to find where the rubber plug under the car is either, the vacuum line.
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