event united mc district 37 in johnson valley,ca. i rode 40 miles 2 20 mile loops. gytr kit on but did not remove grey wire, all free mods done. i ran 96 octane. no other mods done. no backfiring what so ever. awesome throttle response over stock and great power especially up hill climbs. now as far as the rear suspension goes, it needs help. i know i am too heavy for it but man did it pogostick. also for those saying that you rode 80 miles with the stock tank you must not be riding because after only 20 miles i was less then half full and needed to be refueled. and anyone worring about the grey wire just leave it in mine ran great.