I know my car has ran an 11.97 on street tires. This run -
http://www.youtube.com/watch?v=uXGxzcIrKyY - was 12.10 when it was 95 degrees around 1pm. Even I can shift better than the dude in the Shelby video. This was my best run - 11.97 -
http://www.youtube.com/watch?v=wasw45HkU9s
BTW - the other car is a small block, nitrous car.