Just purchased a TJ 97 2.5L 5spd a couple of months ago. The 4 cyl is a real dog. So for I have installed a throttle body spacer ( not much help), a screamin demon coil, wires rotor and cap,(not much help), and a stage 2 chip. I haven't installed the chip yet because the advice was to free up the intake and exhaust first. I'm also considering install of a header with a cat back exhaust. Love to hear how much time involved, or any other suggestions to get a few more ponies out of this motor. I probably could have purchased a 4.0L by the time I get done. Thanks!