( http://www.TFLcar.com ) The 2012 Porsche Cayenne S vs and the Infiniti QX56 have at least one thing in common: most owners will never take them off-road. No make that two things in common: They both also have a V8 engine that produces 400 horsepower. So of course we couldn't help but wonder which of these very luxurious vehicles is better when the road turns muddy and rough in the Colorado Mountains. So which of one of these two is the better off-road worthy ride? Check out this fun an muddy Mashup review to find out.