Here's a comparison test and drag race, which doesn't seem fair at first look. The new Mercedes A45 AMG goes against the CLS63 AMG Shooting Brake. The Mercedes A45 AMG is powered by a 2.0-liter turbocharged 4-cylinder engine that develops 360 hp and 450 Nm of torque. On the other hand, the Mercedes CLS63 AMG Shooting Brake has a 5.5-liter V8 engine that spits out 525 hp and a massive 700 Nm of torque.