For a long time I was happy with the little 2.5L, but eventually with bigger tires and bigger obstacles it got cumbersome. Especially bad on greasy midwest hillclimbs. I had regeared, throttle body swap, injectors, elec. fan, etc. In the end it was either $$$ on a motor swap, supercharger, or a different Jeep. I went with a different Jeep. After wheeling with 4.0L+ power I'll never go back.