I own a 1995 ZJ Grand Cherokee Laredo 4.0, I followed this forum in replacing my injectors. I replaced my stock injectors with the Bosch 0280155703 approximately 5 months ago. I have had nothing but positive results. From the first time I started the engine the jeep idled much more smoothly. The response when stepping on the gas seemed quicker. The best result has been in MPG. I went from approximately 17 mpg to 19 mpg.
I am currently re-reading through the forum because I want to try the same thing on my 1996 Dodge 5.9. If I decide to do this I will also post those results.
I wouldn't do that on the Dodge if I were you. There are some pretty negative posts earlier in this thread from a member doing this on his Dodge. The computers are different and it won't properly handle a 703 injector. Also, the overhead is slightly off, by about 2 mpg, when you go to 703s. My hand calculations stayed about the same. The only thing I've noticed with mine is a smoother idle.
01 TJ - 4.0L, NV3550, 2" Skyjacker budget boost, Xenon flat flares, LoD front bumper, Tuff Stuff rear bumper, RH4X4 sliders, 33" STT Pros on 15x8s