Check out the KOOKS HEADERS product specific video for the 2006-2013 Ford Shelby GT500. This system makes 35 horsepower with just the headers and the X-Pipe with high-flow cats, and it make over 45 horsepower with the full exhaust. Comment and tell us what you think! Don't forget to share with your friends. Check out KooksHeaders.com and "Like" Kooks on Facebook and Twitter!