What a difference 38 years makes juxtaposition of BMW M3, 1985 & BMW M4, 2024. The new M4 has a 480hp twin turbo 3.0 litre straight 6, the original M3 was a homologation special to satisfy the Deutsche Tourenwagen Meisterschaft and Group A Touring rules. It was powered by a 197hp DOHC 2.3 litre 4 cylinder engine.