2020-2022 Shelby Mustang GT500 Long SystemThe Shelby Mustang GT500 is the definition of high performance. If your looking to improve on performance, look no further than the American Racing Headers Long System. Available with your choice of 1 7 8" or 2" primaries (for max effort applications), our Long System is constructed entirely of 304 stainless steel and features a 3" X pipe. A simple cut and mark installation (no welding required) joins the Long System to your existing configuration.