MagnaFlow HM Grade Federal EPA Compliant Universal Catalytic Magnaflow Universal Premium High Flow Metallic Catalytic Converter MagnaFlow Spun Metallic, Stainless Steel Catalytic Converter MagnaFlow 51775 MagnaFlow Universal Catalytic Converters Summit Racing. Magnaflow specializes in superior catalytic converter and exhaust technology. Each converter is designed to the exact original equipment specifications while keeping the Check Engine Light off. Features: 4 inch outer diameter 3 inch in 4 inch out As of January 1st, 2009, performance high flow cats are intended for off road use only in the state of California. Made in the USA and is EPA approved.