if you're looking for more power, you can almost forget it. there are little things you can do here and there but nothing major. i say save your money and regear. and dont waste money on fancy plugs. plain old autolights or champions work just fine. not sure about the newer 4.0s but the older ones werent built for the hotter plugs. my brother put platinum 4s in his 94 4.0 HO and burned a hole through the rings and side of the pistion but like i said, thats an older engine. not sure if the newer ones can hold up or not. i just dont tempt it.
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