( http://www.TFLcar.com ) The new 2013 Chevrolet Corvette Grand Sport and the crazy fast Camaro ZL1 are two of the fastest American made cars that you can buy today. In fact many would say that these two cars represent the very best in American sports performance and modern muscle. So why would we mash them up in a 0-60 MPH performance test and review at a mile above sea level with a new Porsche Cayenne S crossover and perhaps more importantly which of these cars is after. You'll have to watch this video to find out.