I would like to add more power to the ground when needed and better fuel milage. Does anyone have any chips or programers on there JK's; which ones, and what would be the best? Also, does exhaust add a great deal of perfromance? On my last truck it didn't seem to make that much of a differance, but did sound good. Is there any other ways to get better performace and gas milage? thanks

 

Superchips flashpaq, hypertec, jet chip, Edge programmer, prolly some more out there.
I got the flashpaq and love it, not gonna make the jk a race car, but made it more enjoyable for sure. Try the search function, there's TONS of info on these.

 

Exhaust is not really going to give you any big gains unless you start at your headers and redo everything. But that is a lot of money spent for such a small performance gain. Like what's said above, try searching also.

 

Flashpaq here, definitely gives a lot better throttle response and more mpg. I'd say go with a chip before exhaust/intake, you get a lot more bang for your buck.