Easy, bolt-ons... that's your answer, I'd say a cold-air induction and a tuner program would do just that, on top of that I wouldn't worry too much about an exhaust ugrade as that's one of the most common things, I don't think that will scare to many people away from buying something... The other stuff you can just re-install the factory products...
Ohhh where do you live??? I want some super 44's for my truck... I've got Flowmasters now but it's been 5 years and I was thinking about buying new chrome tips, maybe I'll just re-do the whole exhaust, I love the 44's... Man I want you to get them so I can hear what they sound like[:-]