i have the stage 3 SLR lift on my X and am running 33x10.5x15 BFG's. a 285/75/15 tire is approx a 33.1" tire after doing the math, but each tire size differs from brand to brand. you'll have to do alot of trimming on the stock bumper, remove the mudflaps and cut the rear front wheelwell plastic where the mudflap connected to. i have an ARB so i only had to cut the rear of the front wheelwell.