The SL500 was the top-selling version of the SL-Class early in the R230 series. It used a 5.0 L V8 engine, which produced 306 hp (228 kW) and 339 ft•lbf (460 N•m). A 5.5 L 32-valve V8 engine replaced the 5.0 L found in the SL500 for 2007. The engine is essentially the old SL55 engine without the addition of supercharger. The 5.5 litre natrually aspirated V8 can also be found in the new SLK 55 AMG. This model will retain the SL500 name in most markets, but will be sold as the SL550 in North America. It now produces 382 hp (285 kW) and 391 ft•lbf (530 N•m). It now accelerates from 0-60 mph in 5.3 seconds and has a limited top speed of 155 mph (249 km/h). In 2007, Mercedes will create 75 limited-edition 50th Anniversary SL550s. According to another article, Mercedes created 550 of these cars, all pewter in color with burgundy leather, black ash wood trim, 18-inch double five-spoked wheels, and matching 50th Anniversary Edition luggage. The SL600 is the highest-output version of...