JPNinPA, you just helped solve a debate a buddy and I were having. He was trying to convince me to spend $60+ on an aluminum spacer claiming it would "bring the jeep to life" :lol::funny:
check out the link i gave you. that guy was a 2.5 guy and went through all the different mods and then to a 4.0 and finally a v8. he does machining on throttle bodies too, if you need one bigger then a 4.0.
i have used his over bored 4.0 ones on my 4.0s, previously, and they are worth the money