Best thing to do would have gotten the 4.7 or the Hemi in all honesty. I dont think theres a big aftermarket for the 3.7 engine. Itd be alot of money to sink into it and still not come close to the stock V-8 power. Check around, there might be something.. but every little bit helps. K&N might have a fuel injection performance kit for it, and Hypertech or Superchips might have a tuner for it.
'97 XJ... 4.0 4x4 AW4. 2" budget boost w/t-case drop.
31x10.5 Cooper Discoverer ST's on 15x7 Cragar Soft 8's.
Intake, Ported TB, TB spacer, Super 40 Flowmaster.
Baja Aux. Lighting.
Green Jeep Club #185, Nowhere to Wheel Jeep Club member #1
'04 WJ - Columbia Edition - 4.7HO 2WD