[boxhead]

I reckon it was the Doctor that told Shelby he can not drive anymore.
If he had not diagnosed the heart problem, Shelby may have crashed and died (no Cobra's) or he may have raced for another year or more (then ac would have been gone and he would have to look at another supplier of vehicles) (Also Ford may have had there own program running to compete against GM)

So if it was not for the Doctor and his diagnosis, the Cobra as we know and love it would either not exist, or be a totaly different beast.