TaoTao Thunder 49cc. Need advice on performance parts

[J.west1990]

I just bought a brand new taotao thunder 49cc scooter. I really want to put a bbk on it and all the other performance enhancements I can possibly put on it. I've read that getting smaller 4 gram rollers will get me to my top speed quicker. But other than that and a bbk, what other things can I do to get better acceleration and top speed? And where can I buy them from for the best price?