I seen in one of the ultimate adventures there was a red xj that had a e-fan mounted on the hood drawing out the hot air. i bet that makes a noticeable difference.
00' XJ. 4.0/auto. stock rears, custom 5" lift, custom front bumper, 32" BFG MT (wifes toy)
05' libby 2.8 CRD, 2" lift, rubicon wheels, 245s, custom bumper, custom exhaust, GDE hot tune. (wifes DD)