After months of sneak peeks, there are finally some official images and details of the new 2012 Porsche 911 GT3
RS 4.0. The RS 4.0 is powered by a naturally aspirated 4.0-liter flat-six engine that can muster out some 500-horsepower. That puts the RS 4.0 at 50-horsepower more than the regular 911 GT3 RS. The exterior sports some unique elements, including the small canards along its front fascias, a GT style rear wing, carbon fiber hood and RSR-style widened wheel arches.