help out a stang lover

[gt96]

hey i have a 96 gt i have a k&n filter in a stock air intake setup with a marchs ram air induction, phenolic intake spacer, plugs,wires, mac pulleys, flowmaster muffs, mac off road x pipe:
Heres my question see i am goin through school and as soon as i get done i want to buy an older 5.0 but for now i have a 96 gt i need to know what you guys think about what i need to do next without doin stuff like gears nitrous or s\c cuase i will need to sell it soon but if you guys could give me some input on some outher bolt on mods i could do to get the most bang for my buck that would be great i have no one else to get info from cause all auto performance shops round here are for those damn ricers so thanx for your time!