As far as I'm aware MotoGP bikes have straight-through pipes with no mufflers so I doubt it'd be possible to replicate legally even on the track (most race tracks require less than 102dBa I think and MotoGP bikes are _way_ louder than that). They also rev higher, and very significantly faster, than most litre-class road bikes which probably also contributes to the sound.
yeah its legal and its fine, loud pipes can help driver's be more aware of you possibly/probably and of course the tracks are okay with it over here, we have a lot of CMRA in this area too, a lot of bikes running motoGP exhaust style
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