Kooks Custom Headers showed off this complete ’11-’13 Boss 302 system at the show. The system includes a side-exit arrangement, which would also probably work on GTs. The 3-inch system is available in off-road, high-flow catalytic, and 49-state-legal catalytic versions. Of course, these components are available separately, as well. This Boss 302 system is designed to make your Mustang sound like the Boss of any neighborhood or race track.