As important as the extra power was a strict diet for the bodywork. Lightening of doors, boot and bonnet with fibreglass panels, plastic windows and stripping the interior brought the R17’s weight down by more than 25 percent, to just 820kg. Much of this was also achieved by the revolutionary use of many aluminium parts. In all, 14 models were prepared at the factory to represent the R17 on the world rally stage.