just to poke fun a bit...03 and 04 were the only supercharged cobras...but my old boss had one...he had a catback K&N and short shifter and ran 13.4 stock tires. That is at 4400 elevation and 100 degrees.
The same day I ran my WS6 410 to the wheels at 13.2 @108.5
Although I don't claim to be the best driver...I had only run it that day...so I imagine with practice and little cooler weather I could have been high 12's.
