[DanEC]

I'm very happy with the Mickey Thompson S/Ts. I believe they are the same as the Cooper Cobras. I will admit that I haven't pushed my car hard so others may have to vouch for their track or autocross abilities. Because of owning a set I tend to pick up on forum threads where they come up and I don't recall ever reading any negative comment about them.

ERA lines the underside of the top of fenders with coremat which is kind of like a 1/4 inch or so thick, dense woven material - not unlike a thick piece of fiberglass mat. It's rolled in with fiberglass resin. But it will absorb impact. Over that I applied bedliner material. The coremat apparently works very well as star cracks on ERAs is just unheard of.