I have sorta decided to put a supercharger in my wimpy six which means running in CAM. yay! I looked into tire options and it seems BFG rivals are the only ones with 315 or 335 width for my 18x11 forgestar. Or is there other autocross type summer tires available around that size? I was wondering if any of you have used rivals before or suggest a different tire of around that width. For rivals how long do they last (for close to peak performance) if used only for autocrossing? Any particular nuances of it that you know of?