Audi is in the works with the new RS4 as this mule shows. While not the final design, we still notice the RS goodies under the body shell, like the bigger brakes and wider track. The front bumper will be more aggressive with large air intakes and the fenders will be wider just like on the RS5. Talking about RS5, this mule runs on the RS5 wheels.
It’s not clear if the new RS4 will have the same V8 engine found in the RS5, or if there will be a new high reving V6 twin-turbo instead. But in order to be able to battle with both the BMW M3 and the AMG C63 from Mercedes it needs to deliver some 450 horsepower or more.