present near the car The CTR (abbreviation of "
Group C Turbo Ruf") was based on the
1987 911 Carrera 3.2 as opposed to the
930; Porsche's factory turbocharged version of the 911. The decision to base the car on the Carrera 3.2 was made because of the 3.2's slightly lower curb weight and
drag coefficient. Factory body panels including the doors, hood and engine cover were replaced with aluminum pieces, helping to reduce an additional of weight as compared to the vehicle's factory curb weight. Efforts to reduce drag, the use of fiberglass front and rear bumpers and a pair of intake ducts on the rear flares to allow airflow to the intercoolers topped the list of body modifications. The rear arches were also slightly increased in width to accommodate the larger Speedline wheels. In addition to the lighter panels, considerable modifications were made to the engine, including boring the cylinders out to to increase displacement from to , adding an uprated DME fuel injection system originally designed for the
Porsche 962 race car. An upgraded suspension system, 17 inch Ruf Speedline alloy wheels, diameter
Brembo braking system, and
Dunlop's Denloc system performance tyres were used. The company debuted the vehicle at the end of 1987 with pricing set at US$142,900 (approx US$362,000 in 2022), although that number could vary depending on whether a given customer ordered it directly from Ruf or brought in a car purchased via dealer for conversion. Ruf manufactured only 29 cars from chassis bought from Porsche; about 20–30 cars were built from customers'
Carreras. == Specifications ==