This is one of the rarest AMG vehicles ever made. Only 70 units were sold and they were not advertised in the German company catalog. The 2001 S63 AMG, a car that was built for just a month. It was not the most powerful version of the S-Class from that era. It was not the most comfortable car in the lineup. It wasn't even the rarest AMG model (The CL63 AMG was produced in 26 units). But it was the rarest S-Class. It was available only as a long-wheelbase and with rear-wheel-drive. It was offered only to selected customers, most of them being heads of states or other officials. The W220 S-Class was launched in 1999 and it redefined the look for the German flagship model. It went from a bulky, imposing presence, such as the W140 S-Class, to a sleek and aerodynamic sedan. From the outside, there were very few clues that could tell the difference, other than the special light-alloy wheels or the 6.3 AMG chromed badge on the front fenders and in the back of the car. The four oval exhaust pipes in the rear were noticeable as well. Inside, the AMG was just as comfortable as any other S-Class with the long-wheelbase. For the interior ambient lighting, it had three options available, depending on the mood. For a comfortable journey, it was fitted with four massage seats. Under the hood, there was the most powerful naturally aspirated engine installed in a sedan when it was launched: a 6.3-liter V12 unit. It was mated to a 5G-Tronic gearbox, which could handle the big torque. The adaptive suspension was standard so the car would handle better while cornering.