wow you'd think this guy asked if there were cheap upgrades for his hummer, with all the stupid answers he got, flux capacitors, wow you are probably the fat kid who sat home eating mommies cookies all day watching back to the future when you should have been trying to graduate middle school. install a cold air intake, change your plugs, wires, cap, and rotor, and make sure your oil is clean, if not change it, and when yur done run down to a parts store, walmart, or kwik trip, and get some sea foam, add half to 3/4 of that to your oil, then add whatever is left and another 3/4 to full bottle to your gas. ive been in your shoes before and you'd think the jeep forum would be a good place to find an answer...........for your JEEP. However there are so many inbreads on here its ridiculous. Anything after that will be pretty expensive though, but if you take care of all of that, I think you'll notice a difference. To all of you who think you and your Jeep make u cooler than anyone on here, go get a hummer!