1984 Metro 6R4
”Development of the 6R4 was taken on with the help of Williams Grand Prix Engineering — and the resultant racer was of course made of fundamentally different stuff than the production Metro.
Panels of Glass Reinforced Plastic and a little bit of steel clothed a seam welded tubular frame — and the car was actually laid out apparently on the bigger Austin Maestro; hence that jutted jawed and bulbous backed profile.
There was permanent 4WD and the gearbox constructed so that it was relatively simple to change ratios and torque bias between the diffs. Rover of course had to make at least 200 of these cars available to homologate them for Group B — and in 1984 you could buy the homologated package which punched to the tune of around 250 BHP, for around £25K.
Later specs pushed this already punchy figure closer to the 400 mark — and fully race ready packages of these full Rally monsters would have cost you around £40K.” via