Re: New to the board, new mb owner, modifications
First: welcome to the forum
Second: I live in SC. and I have the 54t sprocket installed on a 24" mountain bike along with the 80cc. and I haven't done the intake or the exhaust mods yet but I can say the 54t gives a nice balance for both torque and speed for the bigger guys I weigh around 300 and I do 40mph. on the flatland. Another thing you might also want to check into a boost bottle it might just give you that little extra your looking for.
Hope it helps.