Rubicon at the end of the day is still going to have an underpowered fuel guzzling donk up front.
CRD with exhaust, chip, D Gas. Then
AIR lockers, not electric things....
CRD may end up burning a few more $ to bring up to speed, but from then on every time you turn that key and hear that sound.... you'll know you made the right decision
As for warranty arguement. Pffft.... stock Rubicon needs mods anyways if you do real wheeling, so warrantys mostly out the window.