I finally had time to install the CAI and the new RC steering stabilizer on my 2004 WJ. Both have created significant improvement in the jeep.
RC steering stabilizer: Prevents my car from pulling left or right when braking hard and also doesn't have the slight hint of a death wobble anymore. Worth the 17 dollar bargain I picked it up for.
CAI: Improved hp a lot in my opinion. I wasn't looking for something to crazy because I just have to 4.0 I6, but this definitely helped out with over all performance. Mainly at high speeds- I still have the pick up and go I was looking for.
Any other ideas to increase performance. I was trying to stay away from aftermarket exhaust.