The Carrera GTR was the ultimate 924 Street/Race Car in 1981. The GTR had larger flares, larger wheels and tires, improved brakes and a whopping 375 horsepower from the 2.0L turbocharged dry-sump engine. At $75,000, the GTR would have cost over $200,000 in today’s money, but what you got was a 180 mph screamer for the street, but in full race trim.