Jaguar pulls the wraps off of its XKR-S Convertible today, which promises maximum exposure for those who want blistering performance. The most powerful convertible that Jaguar has ever built, the XKR-S features a supercharged V8 that produces 550 horsepower. Jaguar says the XKR-S will sprint from 0 to 60 mph in just 4.2 seconds and has a top speed of 186 mph. Just 25 2012 Jaguar XKR-S convertibles will be sold in the U.S. with a starting price of $138,000.

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