This BBK Performance short mid X pipe with catalytic converters is specifically designed to be used with BBK full Length Coyote Swap Long Tube exhaust headers 1634/16340 to complete the exhaust installation to your cars cat back exhaust system. This BBK mid pipe is designed and built with 3.00" CNC mandrel bent stainless tubing and high flow catalytic converters for maximum exhaust flow . All BBK mid pipes feature ball and socket style connectors for simple installation and adjustment for good ground clearance. The BBK merged X center section crossover is designed to maximize the exhaust flow potential of your Mustangs high performance engine to get the maximum horsepower and torque available to the ground. Every BBK mid X pipe offers performance, quality and value that guarantees years of top performance for your Mustang.Designed to fit BBK full Length Coyote swap headers for 1979 -2004 Ford Mustang Applications - BBK part numbers 1634, 16340