Porsche’s Type 964–based Carrera RSR 3.8 of 1993 and 1994, built for European Pro GT racing and the North American Supercar Series, was a winner from the outset.

The lightweight RSR 3.8 received its urge from a naturally aspirated, air-cooled six-cylinder Type 64/04 engine based on the 964’s 3.6-liter powerplant.

Increased compression, twin ignition, individual butterfly valves for each cylinder, and Bosch electronic fuel injection produce an official 325 horsepower, but in reality, output was at least 375–390 horsepower.

Torque was rated at 284 foot-pounds.

A racing clutch delivered power to a five-speed manual transaxle with 40% limited slip.

The body shells, constructed on the regular 964 assembly line, were all seam-welded and then sent to Matter for installation of fully triangulated roll cages.

The RSR 3.8 featured light-alloy doors and front lids, and a steel engine cover strong enough to support the large fiberglass rear wing.

Also included were lightweight front and rea...