Re: Cheap but benifical modifications
I'd get the tuner next. The 4.0's respond to bolt on mods much better than the previous 94-04 3.8/3.9's. I'm surprised you have the CAI without a tune. Most require a tune and the ones that don't usually don't offer many gains.
A tuner will take full advantage of those bolt ons ~ exhaust, CAI, pulley etc, wake up your transmission (auto), and do numerous other things like adjust after tire or gear changes.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.