 Complete the following phrase:  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. Jariers new teammate, Pryce, won the non-championship Race of Champions that same year. Pryce died in an accident involving a marshal at the 