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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.

McLaren 650S GT3 race car at 2014 Festival of Speed

By Nikolai Attard First Official Pictures 30 June 2014 12:53 The all-new McLaren 650S GT3 was officially revealed at the Goodwood Festival of Speed this weekend, wearing McLaren’s historic number 59 livery. This is the latest track-focused race car bound for 2015’s GT3 championship and is based on the McLaren 650S and the same carbonfibre MonoCell chassis. Large air intakes and a massive front splitter dominate the new McLaren’s front end, giving it a more aggressive look while new lightweight carbonfibre bodywork wraps around redesigned air intakes for better cooling.

OnStar 'ignition block' disables stolen vehicles

OnStar, General Motors' in-vehicle safety and communications system, has launched a service to keep car thieves from starting a vehicle that has been reported stolen. As of July 20, three stolen cars had been disabled by the technology, called "remote ignition block." The feature is available on select 2009 and 2010 GM models. Subscribers must report their vehicles stolen to police officials and request assistance from OnStar, which then sends a signal that prevents the car from restarting.