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I have had good luck with just adding a street 70cc bbk and jetting to a pretty much stock motor, including stock exhaust, without to much more noise. Plus, the police in the know wont ticket you for a expansion exhaust. But, as always happens, I end up tuning it to get "just a bit more" out of the bbk. Believe it or not, but sometimes the intake system can be just as loud as the expansion chamber! Joys of a 2 stroke.
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