Last year in July I purchased my first Jeep an '02 Sport 4x4 3.7 with auto trans. Of the first thing I did in the first week ownership. Bt this is what I did within the first week.
Amsoil from bumper to bumper
New A/C condenser = Warranty
New Radiator = Warranty
Rear Differential Rebuit =Warrant
Front Rotors Trued up = Warranty
LBJ's =Warranty and Lastbut Not Least
Magna-Flo muffler
Now allow me to state for the record besides the better price of Magna-Flo. It has a sweet throaty tone, not too loud but just sound GOOD. But , truthfully saw no milage improvent, maybe a little better performance but it does sound COOL
If you have deep pockets "Go For IT". If you don't visit this web site as many time as possible, and get as much information as you can. Correspond with as many L.O.S.T. members as you can, that's what makes this forum so cool you have a plethera of information. They not only have been there and done that but have in some situations fond a better way of solving the problem. Some these guys are Mech's and do this for a living. You would never want to meet a greater bunch of people.
GOOD LUCK