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Popping only occurs with lack of back pressure and fuel in the exhaust. It can also be a sign you are running rich. Two things on new unmodified scooter you don't have to worry about. I suppose it's possible to have an exhaust leak out of the crate but that a completely different animal. EGR is a very good thing for an engine I don't know why you would take it off unless it was causing a problem or didn't work with a modification.
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