The A45 AMG is lighter, has all wheel drive, and a dual clutch transmission. But, it is down on power by about 158 horses. Both cars have launch control featuring automatic shifting. On paper, the power and torque disparity is one sided.
Naturally due to all wheel drive the A45 gets a slight jump off the line. Once the CLS63 AMG starts to pull it appears to be game over. Somehow, the A45 AMG pulls back. The result is not expected and the new 45 AMG models certainly are quite potent. Yes, the facelifted CLS63 AMG with more power and all wheel drive will smack this car around but if one has a stock 518 horsepower E63 AMG or CLS63 AMG they better get a tune or these entry level cars may catch them with their pants down at a stoplight. Very, very impressive.