The X-pipe is designed to be used with BBK long tube headers. Part # 1643 / 16430 These BBK short x-pipes are designed from 2-3/4" mandrel bent steel tubing with high flow catalytic converters for maximum exhaust flow. The X-pipe features rear oxygen sensor bungs in the factory location making installation a breeze. Not only is this X-pipe required to finish your long tube header install, it further improves exhaust flow, increasing horsepower, torque and throttle response. High Flow Catalytic Converters For Maximum Flow - For Use With BBK long Tube Headers Part # 1643/16430 Attributes: Brand Name: BBK Performance Parts GTIN: 00197975164315 Catalytic Converters: High Flow Catalytic Converters Installed Clamping Type: Round Band Clamps Included: No Finish: Unfinished Fitment: All BBK 2005-10 Ford Mustang V6 Long Tube Headers Part 1643 16430 Gasket Or Seal Included: No Material: 409 Stainless Steel Pipe Bend Type: Mandrel Pipe Diameter: 2-3/4" Inch Shape: X Pipe Extended Information: Country of Origin: US Emissions : 3 Life Cycle Status: Available To Order Packing Information: Quantity of Each: 1 Package UOM: EA Dimension: 40 x 5 x 24 inches Weight: 24 lb