k&n air filter, and some pipes, most likely some fatty's. They are a real good inexpensive pipe. the only time to get a top end rebuild is if you really need it. if everything is fine then u dont have to buy anything. clutch u dont have to worry about until your puttin out some real hp's.
the links below are all u need for a simple upgrade.
http://alba.buyol.com/Item/banpk.htm
http://alba.buyol.com/Item/PD201RC.htm
if thats too much for ya, hit up ebay , or u can find some stuff for sale right here in the HQ.