The ultimate development of the 924 in its race trim was the 924 Carrera GTR race car, which produced 375 hp (280 kW; 380 PS) from a highly modified version of the 2.0 L I4 used in all 924s, and weighed in at 930 kg (2,050 lb). This allowed for a 0–60 mph (97 km/h) time of 4.7 seconds and a top speed of 180 mph (290 km/h). In 1980, Porsche entered three 924 GTRs at the 24 hours of Le Mans, which went on to finish 6th, 12th and 13th overall. Also building a 924GTR rally race car, and two other GTRs (Miller and BF Goodrich). 17 (some sources say 19) Carrera GTRs were built in total.