The street-legal X-Pipe is a simple “cut & clamp” install behind the factory cats. Te, combined with a Borla rear-section exhaust, gives you a complete Borla Cat-Back exhaust system. The race with cats X-Pipe is designed for racers who prefer to run with the odor-suppression benefit of catalytic converters (while also keeping the “Check Engine” light off), and the cat-delete X-Pipe meets the specialized needs of professional race teams.