 While the new diffuser was implemented, the KERS could not be made to fit the new car and both drivers raced without the device.After the qualifying session for the British Grand Prix Mario Theissen announced that the team had decided to halt further development of KERS; of which BMW had been one of the strongest proponents, and focus instead on improving the car's aerodynamics.This left Ferrari and McLaren as the only remaining users of the KERS system.