I bought a 1998 Xj it had a 4.5 lift on it. But the back was stock so I started two week ago on this jeep. I bought 4.5" leaf springs, all new rubber bushing all new moog tie rods and ujoints,weel bearing, brake rotors all brake pads,transimisson cooler, rough county shocks, rough county front bumper. I also bough a airintake off a 2000 (not installed yet) that is the question I have for all of you. If I put this on what all do I need to do to get the benefit out of it. This is not a daily driver. I will be towing this behind the motorhome

 

If you're referring to the actual hose and filter of an intake, there wouldn't be any benefit as I believe your 98 is almost identical to the 00 you have. However, something that would be of great benefit to you is to upgrade your intake manifold to a 99+ (preferably just a 99). The upgrade increases efficiency and throttle response as well as a bit of power I believe.

 

Sorry I did buy a intake manifold off a 2000 that is what I am asking about what all do I need to buy to get the best performance