best power mod I ever made to any vehicle is chrome wheels. the toyota in my sig can out accelerate and F-15 and out corner an F-22 Raptor (where is the shakes head smiley).
Bird, I am calling you out on this. Lets see that Silverado tow that Bass Boat over Eisenhower or Vail pass in colorado. Come back and tell me how those electric fans do. If electric fans were really better then the trucking industry WOULD be using them....... as I have yet to see it in Fleet Owner Magazine, it will be safe to say that the trucking industry does not use them.
There are a few of us in here that either tow for a living or work on the vehicles that tow for a living. Every single one of us will tell you that there is no freaking way in hell an electrical fan will out perform a mechanical fan.
and just because the dealer installs it doesn't mean it is a good idea, Rush peterbuilt sells Lucas oil stablizer...... Lucas fucks up the oil filters and causes them to pop the by-pass valve allowing contaminated oil into the engine earlier than normal.
MotoXChamp......... you want an engine that can accelerate, that 4.0L SOHC is it, keep it wound up and learn to use the transmission. get lower (numerically higher) gears for it and you won't need to do the other things. All those other mods are only important if you plan on spinning the engine at 9000 rpms. I had a 91 explorer sitting on 31's with 3.73's and I whooped the holy hell out of a V8 Lexus SUV going over fourth of July pass on I-90 in Idaho over 100 mph, the only mod was a device with a switch that allowed me to shut off the the VSS and an autometer 140 mph speedo (ask teffie, she was with me when I did this)
OHV, SOHC, DOHC....... it doesn't matter, you want any gas engine to perform, keep it would up and learn to use the power curve. you factory computer is sufficient for the cam, you do not need a chip.
Again you do not need to make any mods to that engine....... it is sufficient. All you need to do is learn how to drive it.