[Tommy]

There are guys who spend an extra $10,000 just to have an extra 150 HP on their dyno sheet that they will never effectively use. So if the goal is bragging rights, go for the most expensive one. But if the goal is performance, I suggest most buy a steel or aluminum drive shaft and spend the money saved by not buying a carbon fiber shaft on other, more effective performance enhancements (e.g., driving school). ... I agree with those who said the drive shaft on most Cobra replicas is too short for its construction to make much difference.