inatake, exhaust, programmers, injectors etc. but first you will need a clutch to handle the power and put it to the wheels. i would also recommend gauges. i dont think cheap is going to be in your plans though..
you dont need 500 hp for that.. unfortunatly anything you do will cost you money. on my 01.5 i added a 4" exhaust and cai and it let it breathe alot nicer. but then again it was pricey...I want 500hp to put ricers in their place and also some towing....also is there anything at all I can do with out buying anything any kinds of mods?
Ya of you are looking for that kind of power cheap is going to get you nowhere you will be better off spending more money or you will be spending even more money later.Cheap doesn't get you anything but time in a shop. You are goin to pay for parts that have been tried and proven to the industry. And 500+ HP is a pretty good bit, not out of this world crazy, but more than alot of people are running. What are you wanting out of your truck? Towing? Performance? Streetability? What are you wanting 500 Horses for?