In case you're contemplating buying a Mercedes CLA45 AMG, this is how it's like living it day by day. This is a long term test of the CLA45 AMG, which points out quite a few interesting facts about the new high-performance Merc. For those of you who are not familiar with it, the Mercedes CLA45 AMG is powered by a 2.0-liter turbocharged engine that develops 360 hp and 450 Nm of torque. The CLA45 comes with the 4MATIC all-wheel-drive system.