MagnaFlow 99006HM Universal Catalytic Converter (Non CARB Compliant) Stainless steel construction Federal emissions compliant design Formulated for gas and diesel applications Seam welded close to the converter body for a strong, tight bond Made in U.S.A. Catalytic Converter Inlet Diameter - 2.5 Inches / Main Piping Diameter - 2.5 Inches