Ive been reading up on a few fuel injector mods and took the plunge today to try them out. Went to junkyard this morning and got injectors and did the work today in a couple hours on both Jeeps. This is what i got into: I installed 2000 & 2001 Dodge Neon 2.4L injectors in my Wrangler ( had to pull from both cars 4cyl's of course) and installed 1997 Ford 5.0 injectors in my 5.2 Grand Cherokee. These mods are prob. the biggest seat in the pants improvement i have done so far. Grand Cherokee pulls harder and noticed 2mpg better average and also idles smoother. The same with the Wrangler, its pulls harder from 1,2,& 3 gear than before, it idles about 50 to 75 rpm higher not very noticeable but much smoother. The difference in the injectors are the jeeps have 1 large hole whereas the others have 4 smaller holes which atomizes better and a little higher flow rate ....both are plug and play replacements. Only mods i had to do on Wrangler was bend the tabs on fuel rail as the Neon inj. are shorter. Not sure on all the years you can swap but as long as the connections are the same , i don't see any problem they couldn't work on any other Jeep as well, even the 4 cyl's. I recommend the mod and would be happy to assist in doing it.