Jet CHips and the like (computer enhancement), is a waste of time and your money. The 4.0 & 2.5 redline at 5000k, which is still inside the powerband of all the plug-n-play engine mods.
If you want to get more HWY power, there are a fews things that need to be done, in order to have the performance increase.
[B][COLOR=Black]LIFE IS TOUGH ENOUGH ALREADY, IT'S EVEN TOUGHER WHEN YOU'RE STUPID.[/COLOR][/B]
RE 3.5 and all kinds of other relevant goodies, you know winch and stuff.
[COLOR=Red][B]Life is like walking into the No Chance Bar full of Future Darwin Stories........[/B][/COLOR]
More mods than a hillbilly's set of teeth..