Following a streak of leaks the past two months or so, Mercedes-Benz finally came out with an official announcement on the 2009 SL 63 and 65 AMG models. Whilst the SL 65 AMG retains its bi-turbocharged V12 unit that generates 612 HP, the SL 63 AMG is an all-new model fitted with a naturally aspirated 525 HP 6.3L V8 and it replaces the outgoing SL 55 AMG which was equipped with a 515 HP supercharged 5.5-liter V8 engine. However, the big news here is that Mercedes-Benz has equipped the 2009 SL 63 AMG with its first ever double-clutch semi-auto transmission, the AMG SPEEDSHIFT MCT 7-speed sports gearbox. The bad news is that the new twin-clutch gearbox will be used exclusively in AMG high-performance vehicles. Sales of both AMG models will start in
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