Aptly named, the Bentley Continental GT Speed Convertible (bentleymotors.com) is the fastest four-door drop-top on the market. Though the car weighs about 6,300 pounds, it has a top speed of 203 mph and accelerates from zero to 60 mph in 4 seconds. Plenty of power is required to move so much weight so fast, and it is provided by a W-12 that produces 626 hp and 605 ft lbs of torque. The engine is paired with a smooth-shifting 8-speed automatic transmission.
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