The Mercedes CLA was unveiled at the Detroit Auto Show to huge accolades just months ago. Now Mercedes amps the CLA up with an AMG version, the CLA45 AMG. It’s a 2.0 liter four-cylinder pumping out an impressive 355 hp and 332 ft-lbs of torque. 0-60 time is just 4.5 seconds. This motor is rated at 178 hp per liter and Mercedes states that this is the most powerful four-cylinder production engine.
