I ran a 75 shot on my 2006 with the 4.0. No engine mods needed, just a proper tune.
Get a window switch. Don't rely on your system reading WOT. You need the window switch for safety. You don't want to spray under 2,400 rpm, or bad things can happen. Before I put the window switch on I was lining up. Brought the rpm up to 1,800 and the system decided that was WOT and fired off. I was able to lift quick enough to not damage anything; a friend was not as lucky when it happened to him.
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