engine? If so pick your poison http://www.importpartspro.com/niin.html I agree with Tony's (BigTDogg) list but I would do the ECU almost last and since you are in Cali have SpecialtyZ do the tune. That way you are tunning for all the mods (exhaust, dual intake, intercoolers, etc) and not having to buy a socketed ecu then tunning later on down the road again.
"Do you guys put the key in "balls down", or up?" -BobbyT 10:28:19 03/06/09