Quote:
Originally Posted by cdeslandes
That has the side effect of causing rough idle with a cold engine.
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No problems here, and I've have the mod for a year. Some use the "golf tee" to do the same mod. The sound at idle might have a bit more "rumble" but it isn't rough. I'm not sure how opening the flap at the tail pipe would cause the engine to run rough at idle - the required back pressure is created much further up.