The chassis of the 550 A Spyder is based on the Porsche 356.
Need for Speed: Porsche Unleashed
The 550 A Spyder appears in Need for Speed: Porsche Unleashed as a Race class vehicle in the Classic Era category. In the PC release, it is rewarded to the player upon winning the Classic Era bonus race and is purchasable in the car dealer for $50,000.
The racing-tuned 1.5L engine produces great power for its displacement, and combined with its extremely lightweight chassis and body, the car has an excellent power-to-weight ratio, capable of achieving better acceleration and top-speed than more powerful cars developed much later, including but not limited to, factory-spec first generation 911s of 1965 - 67. The major problem is that the 550A tends to understeer at high speed.
Although qualified as a Race class car, this vintage racing machine cannot really stand toe-to-toe with a fully upgraded 911 of the classic era.
Slick and rain tyres cannot be purchased for the 550 A.