I know the current "G force" tires are, but I think they may remain the same. I hope. It is a strong market for the comp t/a's, I dont know why they'd do away with them.
Drag radials have gone into the 7's on mustangs. I believe Dwyane Guthridge went 7.98 on a set of 315/50/15s.
The current line of G-force tires have a unique tread pattern, and are an autocross tire. Theres always Nittos or the new mickey thompson tires, but I always liked the BFGs.