i dont run the alterkation kit, but i have tubular UCA & LCS's. Currently im running a 245/40/18"s up front and 285/40/18"s in the rear. I can fit more tire on both but i played it safe since my first time with running the wheels and tires. a 255/40 would probably fit better on the wide rim up front but may needs some trimming to the fender, a 275/35 would probably fit as well. i can fit a 295 in the rear and still have clearance. but i think much more then that would be a stretch since i am on hotchkis leafs and dr diff offset kit. Unfortunately i dont have any good pics since the car is still in the garage, hopefully i will have it running in the next few weeks (never thought to upgrade alternator when i went to efi so car wont stay running because of voltage drop below 11vdc......im an idiot...LOL) and a poked a hole in my radiator so yeah....