Absolutely nothing......they fixed a lot of the recalls on the car such as the tick from a defective cylinder head, and the vibration coming from the driveshaft....and also the clunk from the rear end.....
All that stuff has been fixed, you can pick up a used 03 cobra from anywheres in the 25000 (and slightly below) to about 28000 (Thats the MOST I would pay) but make sure it's a late model build, lesser problems........