Watch: Audi RS2 Takes On BMW E30 M3 Share Comments It’s a BMW vs Audi battle from the past. Well, the cars are from the past. The battle was from just last week. It’s a BMW E30 M3 vs the Audi RS2. A 2.3L naturally aspirated four against a 2.2L turbo and all-wheel drive. There’s a big power difference, but there’s a big weight difference too. So is it going to be a blow-out, or is this race going to be closer than you might expect? There’s more than just a drag race, too. There’s a driving comparison of the two classic Germans. So watch and enjoy.