These BBK Performance short mid pipes with high flow catalytic converters are specifically designed to be used with BBK full Length exhaust headers to complete the installation to your cars exhaust system. This BBK mid pipe is designed and built with 2-3/4 in. CNC mandrel bent tubing for maximum exhaust flow and high flow steel substrate catalytic converters. All BBK mid pipes feature ball and socket style connectors for simple installation and adjustment for good ground clearance. Every BBK mid X pipe offers performance, quality and value that guarantees years of top performance for your Hemi powered car. Required Matching Mid Pipe for BBK Long Tube Headers 1647 & 16470