you could just go to summit racing and and pick up a fogger kit and attach it into your air intake just above the tb. unless you want to go out and get a direct port injection system and spend a lot of extra money on other parts....
it seems like a fogger would be best. just remember that b4 you go out and get this, you will have to find a shop to fill your bottle everytime you want to gas it. and you are probably going to need new internals for your engine after a couple of runs on the no2.
The Almighty 2" BB Jeep Club Member #34 (no more BB)
Silver 98 ZJ 4.0 I-6
K&N FIPK Gen II
JKS Adjustable Track Bars F and R
JKS Adjustable Control Arms
JKS Quicker Disco's
Kevins 3.5" Lift Kit w/ MX-6 Shocks
US Wheel 15x8 10 spoke black Steelies, 31" BFG AT KO rubber