Just like Ford with its RS200, Austin Rover wanted the ultimate Group B World Rally Championship machine, but had to homologate 200 road-going models. The project was given to Williams Grand Prix Engineering in 1981 and by the end Of 1982 they had their first mid-engined Metro with a V6 that was simply a Rover V8 minus two cylinders. Later production cars used a bespoke V6, dubbed the V6 4V because of the four valves per cylinder. While the car looked like an Austin Metro on steroids, it only used that car's body, strengthened by an integral roll cage and using MacPherson struts at each corner of the tubular chassis. The car had a full length undertray which hid three torque-splitting differentials on the four-wheel drive system. Road going cars had 250bhp (186kW), but later Evo models were up to 410bhp (335kW) while full rallycross cars could produce 600bhp (487kW).
MG Metro 6R4 Specifications
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