It's not often that a convertible can hit 60 mph in 3.4 seconds, but the Lamborghini Murcielago Roadster manages to do this, and then some. First introduced as a 2005 model, the Roadster was created for customers looking for an even more thrilling ride than the coupe had to offer.

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The latest iteration of the car is called the LP640, first introduced as a 2007 model. It offers 631 horsepower via a 6.5-liter V12, improving performance significantly over the original Murcielago Roadster. The huge motor churns out 487 pound-feet of torque at 6000 rpm.

The Roadster is very similar to the coupe it is based on, with a few exceptions. The only exterior change -- aside from a retractable canvas roof -- is the addition of cooling vents behind the air intakes. The interior has also been modified somewhat, and the body structure has been reinforced to compensate for the lack of a structural roof.

The Murcielago LP640 can be had with a six-speed manual or six-speed automated manual transmission. Either way, the sprint to 60 mph should take no more than 3.4 seconds. The mid-engine supercar comes standard with all-wheel-drive.

It features scissor doors, a rear spoiler that can be raised to an angle of 70 degrees, side air scoops that automatically open at speed, folding side mirrors for increased aerodynamics, and electronic Launch Control.

Given its unique convertible configuration, the LP640 Roadster doesn't have many direct competitors. The Mercedes-Benz SLR Roadster might be considered one, but it costs nearly $150,000 more. Ferrari doesn't sell any roadsters with this kind of power, and Aston Martin's DB9 Volante has considerably almost 200 less horsepower. With this in mind, the LP640 Roadster is a pretty unique offering.