2005, and 2006 (only some versions). Not all versions were available in all model years. S 350 (in the US this was available in 2006 only; had 3.7L V6 and 5-speed Automatic transmission) S 430 S 500 S 600 (naturally-aspirated or twin-turbo V12) S 55 AMG (naturally-aspirated or supercharged V8) S 65 AMG ( twin-turbo V12) Some models had options for Sport package, Designo, and/or 4Matic. In the United States the W220 S-Class was introduced in 1999 for the 2000 model year, replacing the W140. The type was noted as being the leader in the U.S. car market for luxury cars, and early reviews were mostly positive but noted the amount of money that could be spent on options. At the time, the US was the second biggest buyer of S-Classes, after Germany. In 1999, Mercedes-Benz sold 189,437 and hoped to exceed that the next year. One automotive magazine spent several thousands on options for their review of the 2001 S-Class. After choosing an S 500, they added Distronic (a smart cruise control system), Active Ventilated Seats, the "Timeport" phone with a voice control system, and the sport package (AMG rims and trim). This increased the price from the mid US$70,000s to the $90,000s after delivery and taxes. Other US models available at this time were the S 430, S 500, S 55 (AMG model), and S 600 (the V12). A four-wheel drive system became an option for 2003 for the S 430 and S 500 along with mid-life upgrades that targeted a range of interior and exterior features. In the last U.S. W220 model year a V-6 was offered as the S 350. Another special option was called the "Designo", which matched special interior and exterior colors and materials. An example of this is that one such model used Elm wood in the interior. There were two designo additions offered, the Designo Espresso Edition and the Designo Silver Edition The twelve-cylinder S 600 included interior upgrades, including an increased amount of leather over more interior surfaces. The W220 based S 65 AMG was also offered in 2006 concurrently with the new W221. The S 65 had a 604 hp, 738 lb-ft twin-turbo V-12 and other miscellaneous features inside and out. It retailed that year in the United States for about US$180,000. The V-12 had a displacement of 6 liters, in a single overhead cam, 36-valve configuration, and was paired