I just wanted to leave a comment on my experience with this mod. After reading some that say it works and others that say it is a waste of time, I chose to spend the cash and try it for myself.
I have a 95 with the 2.5 and manual transmission. Initially, I did not notice any difference other than the engine ran a bit smoother. Driving was identical and
I could not feel any real power increase. After about a week and a half, I have noticed a bit more response and, yes, a slight power increase. This is a seat of the pants feel, so nothing supported by dyno or other real measurment.
To compliment the injectors, I do have a 4.0 throttle body that I machined out to 60mm.
Overall, I am happy with the mod and would do again.
To me, RC is kind of the Harbor Freight of springs. Sometimes you get a good deal and sometimes you don't.