Depends on what you are looking for performance-wise. Funny just answered this question for someone else. You won't get any add'l off-road performance from running 1" spacers w/ stock suspension. Not sure what effect, if any, this will have on your ACE. You'll be able to run (slightly) larger tires but you are probably better off w/ some trimming -or- upgrading the suspension system to OME, Bilstein, or some combination thereof. If you are running stock bumpers you should get a solid 2" out of OME springs. Some like OME shocks, others feel they are too soft. Depends on what you like & what type of terrain you drive.