Laws vary from state to state. Some laws requre that mopeds have 2hp or less, and a Biturbo will bring you up at least 1/2 of a horsepower. But I've managed to get away with it. I suppose it's like putting a glasspack on a car or something. Usually, the main concern of the law is pollution and noise. Biturbo's aren't any louder than any motorcycle and there aren't really any pollution laws on mopeds, so I'd say you could get away with it, but if you want to be on the up and up, check your local laws first.
Re: Bi Turbo exhausts (legality?)
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