im thinking t5 but from what i been reading up, pro circuit is a good way to go, i do trail riding so im gonna pick something with low to mid range, my plans for now is to get new rear tires it still got the factory ballons tires and they suck, installed rear spacers that came with the deal, it already has spacers on the front, im gonna get a new uni air filter(still got the factory on it)and maybe a graphics kit the bike is in so good condition that im just gonna enjoy it for a while before i do anything major to it