I should think 11's would be easily obtainable. Since this is my first Cobra after 35-40 Corvettes in the last 25 yrs, I can only tell you about mine. SBC with a little over 600 horse. and auto trans. First time to the track ran 10 5's and 6's @ 127 mph. This was with a 3.07 rear, and MT StreetET tires. Right before I put it up for the winter I switched to a different rear with 4.10 gears, and didn't get a chance to take it to the track. I'm guessing low 10's and by the time I get everything dialed in maybe a 9.90 something would be in the works. I had the frame stiffened and reworked, so hopefully this will aid in the quest for the 9 second time slip
