Where can I get one, and how much are these kits?it is one of the most common mods done. most people do a 520 chain coversion and -1 in the front +2 in the rear. the bike will accelarate quicker, it will also shorten the gears a bit since it will raise the rpms. it will slightly lower the top speed. and yes it makes a big diferance in performance, imo it is def worth it.