A legend that did not live for long and could not show its full potential, a brutal British monster. Under the Umbrella of Austin Rover, the Group B Rally legend was born in 1984 with immense power and promise. Metro 6R4, the name suggests the engine and drive details – V6, mid-mounted rear engine, and 4-wheel drive. The only naturally aspirated car to participate in the ill-fated Group B. It showed promising potential in the test runs and stood 3rd in its first Rally appearance, but sadly could not win any of the championships due to powertrain issues. Although, the national and international success cannot be denied and it is regarded as a car that could’ve dethroned any rival, had it lived longer.



British Leyland, the parent company of Austin Rover decided to add some spice to the recently gained success of Austin Metro. In 1984, the William’s Formula1 Team, sponsored by the manufacturer took the job of designing and modifying the 6R4 from scratch. The road version of Metro only donated a few body panels and the rest was all brand new, from chassis to door panels. A Buick’s V8 engine was amputated to transform into a V6 that would power the 6R4 and after its retirement, it went on to propel the very famous Jaguar XJ-220. Despite no success in WRC and good performance in other competitions, MG Metro 6R4 really conquered the Rally Cross.


Mg Metro 6R4 was a 3 door hatchback based on an LC8 platform made of steel tube-frame with an integral role cage. This structure was rigid and strong enough to handle the weight and acceleration, provide safety and weight distribution. The rally version of MG 6R4 weighed only 960 kg.


The engine in MG Metro 6R4 was a Buick-derived 3.0 L V6 rear-mounted mid-engine, that sent the power to all four wheels via a 5-speed manual transmission. The engine produced 410 horsepower and 388 lb-ft of torque. The 0-62 mph time of 6R4 was blistering 3.4 seconds and had a top speed of 140 mph.


Although the 6R4’s WRC career was short-lived in Group B and could not attain much success, but was really triumphant in the RallyCross and other championships.

  • French National Championship in 1986.
  • British Rally Championship, 1986.
  • Won the European RallyCross championship in 1992.
  • Won the Circuit of Ireland Rally in 1986
  • Stood victorious in Skip Brown Gwynedd Rally 1985.


The initial road-legal units that Austin Rover produced to comply with Group B homologation rules were called the “Clubman”, which had reduced power and better cosmetics as compared to the rally version. There were ~20 units that were modified for various racing and rally championships and were referred to as the “International” version of MG Metro. Then there was the WRC compliant rally car – the original MG Metro 6R4 that debuted in 1984 at Lombard and retied with group B’s disbandment. There was a one-off version, owned by Will Gollop, that ditched the naturally aspirated induction system and souped up the car with Bi-Turbo. This version had 700+ horsepower and ripped the RallyCross apart with its brutal power.