ok id like to share this story. i was out riping it up and this kid i knew in like 3rd grade was there. on his trx 450 well i was talkiing to him and i asked him what he had done to it he says anything u name its go it i go bbk he says no. i go what kinda exhaust he goes i took the baffle out so its better than an aftermarket exhaust. whats done to it he says a custom cam rjatv built just for him and a stage 5 crankshaft ??? and its the fastest 450 around here. well we were both guning it and i was right up his a** til like the middle of 3rd well i race my one friends trx 450 big gun exhaust and air filter hes gone b4 i get outa second. o and he can smoke a piped jetted yz 490 and the yz has a bigger crank in it. but i cant remeber how big i just wanted to share my like to slap this mo fo moment with u guys.