I would like to do exhaust, vent the airbox, possibly add a power bowl (or a quick start, etc) and supercooler or fan set up, as well as a 14/50 sprocket. I ride in the Arizona desert. What recommendations do you have and the stock jetting is a 40 main and a NCVT needle? The bike is a 2006 CRF250X and is currently stock. I would like to make it into a 250R trail bike/:thumbsup:faster enduro, basically.