You may find that by the time you finally sort the jetting and pipe out to get a nice plugchop you may end up with the same amount of hp and a peaky powerband (you are going to put a pipe on it for the max benefit of the setup , right ?? ). But since we're more after torque for rideability as well as topend you may want to reconsider the larger Treats setup . As for the law pulling you over , unless you ride to attract attention with a loud pipe and are passing people above the speed limit - it's no big deal. Pretty funny ,There's a little old lady about 58 who I see once in awhile ride her grandson's ped (loud and fast) pass me on main street doing 45+ on a 2-speed Towny (I know , I sold it to them) - wouldn't stand out if she was quiet and behind me . An occasional blast to pass is no big deal but it appears most people riding peds nowadays are pushing their machines and speed limits bigtime . I tend to wonder if enough "kids" on mopeds start riding like the goped kids of years ago - that eventually the law will screw it up for everyone once they start clamping down . In a nutshell I'd go larger just for the rideability and wider powerband .