Testarossa.
According to Wiki “The Ferrari used in the first two seasons was a kit replica based on a 1980 Chevrolet Corvette C3 chassis that had been modified with Ferrari-designed body panels by specialty car manufacturer McBurnie. As legend has it, Michael Mann spotted the car in a used car lot some time prior to shooting the pilot movie and thought it would look nice in the series. For publicity reasons and because they were unhappy with a fake getting this much attention and being portrayed as a bona fide Ferrari, the automaker donated two brand new Testarossas. One of them was partly stripped and modified and placed on a camera truck, while the other one could be seen in regular scenes. They were delivered in black but were repainted white to show up better in night scenes. For the more risky stunt scenes, yet another fake was used, this time a DeTomaso Pantera fitted with Testarossa body panels.â€