i have a 2002 4x4 lb 4dr 6 speed 6.5 lift with 35s stock exh. with cut cat & muffler superchip programer o & 373 gears & i get around 22mph with cruize set @ 68
i have the superchips & love it. the only down side is that when you want to change settings you have to go through the prosses of key on key off & so on.but other than that cant complain