After a successful foray into the Can-Am scene, Porsche returned to Sports-car racing this year. The Martini-sponsored works team bought the evolution of the Carrera RSR. It was now powered by a new 2142cc flat-6 engine, augmented by the exhaust-driven KKK (Kühnle, Kopp & Kausch) turbo used in their Can-Am cars, that pushed out 490 bhp (and was equivalent to 2999cc using the x1.4 equivalency). It also featured improved aerodynamics (front spoiler, wider wheel arches, full rear wing) and upgraded transmission and braking which all made them slightly quicker than the Matras in a straight line. The two cars were driven by Gijs van Lennep/Herbert Müller and Manfred Schurti/Helmuth Koinigg. There were also older Porsches in the Group 5 field: including a non-turbo RSR special from Mexican Héctor Rebaque and two 908/02s returning from the previous year run by Swiss André Wicky and Ecuadorian Guillermo Ortega.