An exhaust kit wont do much. I agree with the guy above. You didnt even get the bike yet, and you wanna make it faster? Do you want faster acceleration, or higher top speed?? You can change the sprockets to gain top speed, or go the other way and you will gain acceleration and lose some top speed. Just concentrate on getting the bike for now. Then when you own it, and can ride it to its limits, and you want more, modify it, or sell it and move up a level or two. Mike :)