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More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.

Video: Porsche previews the new 911

The lineup of debuts expected for this year's Frankfurt motor show include a redesign for the venerable Porsche 911. Now, Porsche has treated us to a little preview, courtesy of a video posted on its YouTube channel that chronicles some final validation and hot-weather testing of the next-generation 911 in Africa. You can catch glimpses of the new car's exterior and interior, as well as some driving footage.

Nissan gets a new 'Leaf' on life

On Thursday, Nissan announced that its all-electric Leaf will be added to its Certified Pre-Owned Vehicles program. Starting in September, Nissan will back all used Leaf vehicles to provide years of performance and quality at a competitive value. The program will not only provide buyers with eight-year/100,000-mile battery warranty coverage, but also with five-year/60,000-mile coverage for battery-capacity loss that falls below nine bars, which is imperative when you're relying solely on electricity to power your vehicle.