The Cadillac that won the Car Craft real street eliminator competition a year ago, which included an autocross, did it on Nitto drag radials. He also runs the Caddy at Blackhawk and Road America (in the 2:40's) with them. Nitto said they would present no problems even on a sled like a Caddy.
Considering the that the Caddy weighs much more than a Cobra and that it runs faster than most Cobras at RA, I'd say the Nittos perform well.
http://www.popularhotrodding.com/eve...0309_wideopen/
http://www.carcraft.com/eventcoverag...al/index5.html
Scott