Gotta be a 4.0 if its automatic. I have a built Jasper 2.5 with full header & exhaust, cold air intake and the whole 9 with a 5 speed, still under powered. It'll get the job done but i test drove an auto 4 banger. Noooooo thank you. Im happy with my Tj no doubt, but seriously doubt id ever get another 4cyl.