I was wanting to know what are some cheap preformance upgrades for a 00 mustang gt, on summit race, there was a spector intake for like 130 bucks, would that do much preformance wise to make a differance, i have a k&n in stock air box, also a upper plenum made by trick flow around a 100 bucks, or a new throttle body, would any of those mods be worth the cash, and would they require a computer to interphase with them? Thanks alot