thier kuhmo's i think 245/40/18 i just had to put them on car came to me with casically 4 slicks had them all put on mount and balanced all ready to go... ill have to call dude about the exhaust and see if he has the paper work.. sounds really nice tho.. but then again any mustang with exhaust does... like i said befor not a mustang fan just came out better on a deal so i took it..