Grubee SkyHawk 4G T-Belt Drive V-Mount Kit, With HuaSheng 49cc Engine is the kit i was looking at. one thing i need to know is this kit campatible with sbp 4 stroke kit? another id like to know is what kinda upgrades can i buy for this kit? for instance will the sbp expansion chamber work on it? o and any ideas on what bike i can use that cost under 260? im looking for something with front shocks, disc brakes, and a decent derailleur.