The new DN5 driven by Jarier gained pole position in the two first Grands Prix of the 1975 season but suffered mechanical failure in both races. The DN5 and most other Shadow Formula One cars used Ford Cosworth DFV engines, which produced around 490 bhp. However, later in 1975 another car was driven by Jarier, the DN7, and was fitted with a Matra V12 engine producing around 550 bhp. The wheelbase was substantially lengthened to accommodate the much larger and more expensive French powerplant, although due to budgetary issues, the Matra-powered DN7 was doomed as a one-off. Jarier's new teammate, Pryce, won the non-championship Race of Champions that same year. Pryce died in an accident involving a marshal at the 1977 South African Grand Prix. The marshal, Frederick Jansen Van Vuuren, had been running across the track to put out a small fire on the other Shadow car and Pryce was unable avoid the collision because he was un-sighted behind the March of Hans-Joachim Stuck. Pryce struck Van Vuuren at speed, and was hit on the head and killed by the fire extinguisher Van Vuuren was carrying. Before Pryce's car finally came to a stop it hit Jacques Laffite's Ligier resulting in both cars crashing into the barriers. Van Vuuren's injuries were so severe that he could initially only be identified by his absence from a marshal's meeting after the accident.