TheSL500 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 the non-AMG SL-Class models. It uses a V12 engine which produced 493 hp (368 kW) and 590 ft•lbf (800 N•m) from 2003 through 2006 and was uprated to 510 hp (380 kW) and 612 ft•lbf (830 N•m) for 2007. It accelerates from 0-60 mph in 4.7 seconds, according to Mercedes-Benz. However Car and Driver achieved extremely impressive acceleration test figures with 60 mph (97 km/h) achieved in just 3.6 seconds, 100 mph (160 km/h) in 8.6 seconds and a Quarter Mile run in 11.9 seconds at 120 mph (190 km/h). The SL55...