get a 2 piece bi turbo pipe, they are 70 bucks from mopedwarehouse.com the shorter u make the pipe more top end, u can get a amal carb there about 80 bucks, you can get your exhuast ported, i did mine myself and i get 4mph on top speed and my mid range is alot better i am going to expermint with porting the transferports and intake port and i will let you all know how that goes, u can get a speed sproket they add like 5 mph and there only 30 dollars