Not trying to be rude, but you probably haven't lived in high altitude locations. At 6000' you will have about a 20% loss in horsepower (see Wallace Racing - Braking HP Loss at Altitude Calculator). 240 or so BHP (~190 RWHP) on a 4600# (4x4 weight - 4x2 Jeeps are a joke in Colorado) vehicle will certainly not win you any 0-60 speed records.