yes, the GrB cars were the most powerful FIA rally cars. by '86, they were making in the neighborhood of 500-600hp out of ~1.8L four-bangers. weights were under 2000lbs IIRC.
however, i believe the most powerful rally cars period are the pikes peak international hill climb open class cars. they make ~900bhp at sealevel.
however, i believe the most powerful rally cars period are the pikes peak international hill climb open class cars. they make ~900bhp at sealevel.