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SRT Viper dukes it out with Mercedes SLS Black Series in new Head 2 Head

In Episode 36 of Motor Trend's Head 2 Head, now that the Corvette ZR1 is no more, Jonny Lieberman has to look overseas to the Mercedes-Benz SLS AMG Black Series for a challenger with similar philosophy to the SRT Viper: long hood hiding a high-horsepower engine set way back, rear-wheel drive, tiny trunks. That puts the Viper's 8.4-liter V10 with 640 horsepower and 600 pound-feet of torque against the SLS AMG's 6.2-liter V8 with 622 hp and 468 lb-ft.
However, the congruences in philosophy and magnitude of numbers doesn't translate to the driving experiences of the two, which are literally and figuratively on different continents. Lieberman gets a handle on the two of them on Northern California roads, Randy Probst then finds out how, and how quickly, they can lap Laguna Seca.
They both get kudos for being improvements on their original sources, but only one of them can take the win. You can find out by watching the video below.

Rare Isdera Imperator 108i flexes its considerable muscles

The Isdera Imperator 108i is a remarkably rare supercar from the late 80s and early 90s. Born of a Mercedes-Benz concept car, it's powered by a range of AMG-developed V8s, with five to six liters of displacement, depending on the engine. The example shown here, lapping the legendary Spa-Francorchamps circuit, features the most potent 6.0-liter V8 available. And rather than just being driven about on a perfectly clean racing line, it's freaking power sliding!
Yes, there's something eternally childlike about a wedge-shaped supercar from our formative years being flung about a Belgian racetrack. Adding to the appeal is the Imperator's stumpy, periscopic rear mirror, sticking out of the roof. Even after being out of production for 20 years, this is still a wild, wild car and we'd happily snap up the opportunity pilot one of the 36 Isderas that were built. Take a look below for the full video from Spa.

Clark Gable's 1955 Mercedes-Benz 300SL Gullwing doesn't sell, then does sell for $1.85 million [UPDATE: w/video]

How much extra value does previous celebrity ownership add to of a car? Really, there's no way to know until the car in question hits the auction block and bidders start raising their hands. In the case of the 1955 Mercedes-Benz 300SL Gullwing you see above, the celebrity owner is none other than Clark Gable, who purchased it new. After Gable's death in 1960, the car changed hands a few times before settling with Charles Wood in 1975.
A high-dollar restoration was performed in 1989, and period accessories added by Gable himself were kept in place, including the Rudge knock-off wheels and Nardi steering wheel. Any Mercedes-Benz 300SL is worth a big chunk of money. In the case of Clark Gable's old Gullwing, the bidding stalled at $1.9 million here at the 2013 Barrett-Jackson auction in Scottsdale. As one of the 5000-series cars, this 300SL carried a reserve, and a bit of after-the-fact dealmaking saw the car change hands for $1.85 million.
You can see our high-res image gallery above, and the car's official auction description below.