BBK 2.5 inch H-Pipe with Converters for Ford Mustang 5.0L for all BBK 86-95 Mustang direct replacement H-pipes feature 2.5 inch diameter CNC mandrel bent aluminized tubing. It has two high flow catalytic converters to ensure maximum flow, horsepower and street ability. The OEM original 02 sensor locations and factory style die-stamped flanges ensure a perfect fit and BBK dyno testing has shown solid gains of 12-20 horsepower.