need a list of mods. you cant get more speed and more torque. you either get more top speed or more low end torque. if you have stock blaster tires and get a 14 in the front(stocks 13) then you will have a higher top speed. but say you had 18 rear tires and put a 14 on, you'd be pretty much at stock speeds again. but if you have enough engine mods you can go 14/38 for high top end. dont do that if you dont have alot of mods because you will loose alot of low end if you dont have enough power to begin with.
for instance, im putting a 38 in the rear to go along with my new 14 because im putting on a vitos 240 kit, plus a bunch of other mods that i already have so i wont loose low end because im adding power.