No other aftermarket company has had a longer relationship with Ford and the Mustang than Shelby. With its recent resurgence into the aftermarket for the S197, Mustang owners can own and drive a genuine modern-day Shelby Mustang. Last year’s SEMA brought the CS6 Mustang, a V6 Mustang featuring a host of performance and suspension upgrades. While pushing well over 300 supercharged horsepower, the CS6 still left a lot to be desired. Shelby finally brought the goods at the 2006 SEMA Show when it …