I am running all Splitfire in my 92. The plugs and wires have done just fine from what I can tell. I have Bosch plugs and splitfire wires in my 92 Ranger though, and wished I had all Splitfire in it to. I would stick with the Splitfires.
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Brian Green
92 2wd Explorer w/
6 inch Suspension lift
92 2wd Ranger w/
5.5 inch suspension lift