If the XKR Coupe is Jaguar's answer to the BMW M6, the XKR Convertible must be the company's solution to the Mercedes SL AMG. It offers the same 510 horsepower V8 as the coupe, with the added allure of a convertible top.

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In addition to its massive horsepower rating, the AJ-V8 Gen III 5.0-liter engine delivers a whopping 461 pound-feet of torque. The sprint from zero to 60 mph takes just 4.6 seconds.

There's not a lot of space for rear passengers, but the driver and his or her passenger enjoy a luxurious grand touring experience with enough power to give most sports cars a run for their money.

The XKR Convertible owes its handsome looks to a unique design approach taken by Jaguar's team. Instead of designing the Coupe first, the design team began by penning the Convertible. This strategy ensured the drop-top doesn't simply look like a coupe with its roof chopped off.

Like its coupe counterpart, the XKR Convertible has unique styling cues such as a more aggressive front fascia, air intakes on the hood, aluminum-finish grilles, more creases on the hood, and quad exhaust pipes. Customers can chose between 19- and 20-inch wheels for the XKR.

The XKR's roof is a power-latching, self-stowing system with three layers including Thinsulate insulation and a Rakona headliner. When the top is down, an aluminum tonneau cover conceals the canvas roof. While many convertibles are only offered with a black roof, the the XK can be ordered with gray, burgundy, green or dark beige canvas.

The XKR's suspension has been tuned for a more aggressive ride. Changes include up-rated springs and dampers, plus a recalibrated computer to control the dynamic suspension settings.

As is the case with the regular XK convertible, the XKR model is built around Jaguar's ultra-strong "Lightweight Vehicle Technology," which does not need traditional stiffening panels to achieve a sturdy body structure. In fact, the XK convertible is 19 percent lighter than the previous-generation XK drop-top.

A six-speed automatic transmission with steering-wheel-mounted paddles is standard. On downshifts, the system creates a throttle blip to shorten over-run shifts. An "active" exhaust system ensures the XKR is quiet while cruising, yet still able to create purposeful V8 roar under hard acceleration.

Although they are not a legal requirement, the Convertible features a Roll-over Protection Device consisting of two aluminum hoops that are automatically deployed if the car's sensors detect the onset of a roll-over accident.

Other standard features include adaptive headlights that swivel in corners, aluminum-finish side window surround, stability control, keyless entry and start, a seven-inch touch screen to control various car functions, and a body-colored spoiler.

Options include a 525-watt Alpine premium sound system, Sirius satellite radio, soft-grain leather, a leather-wrapped instrument panel, and a heated steering wheel.

All XKRs are fitted standard with an iPod and USB connectivity interface, an air quality sensor, front park assist and electrochromic and heated power fold-back mirrors.