In 2003 the engine options changed. The CL 55 AMG became supercharged allowing the car to accelerate from 0-60 mph in 4.27 sec according to Motor Trend and the V12 CL 600 had 2 turbochargers added and a slight engine reduction, from 5980 cc to 5513 cc. Both cars produced the distinction, again, was the ghost like quietness of the CL 600 as compared to rather noisy CL 55 AMG. The CL 600 was conservatively rated by Mercedes-Benz as not to take sales away from the AMG CL 55. A dyno tested stock CL 600 was closer to 540 hp. Car & Driver's acceleration test delivered a 0-60 time of 4.3 seconds. The more powerful CL 65 (2004-2006) produced . The top speed of the CL 65 was limited to . These numbers are the stock performance ratings for the AMG CL 65.