Chevrolet Expressbefore: 2007 Chevrolet Express RT Exhaust Aftermarket 2nd Catalytic Converter $250after: 2007 Chevrolet Express RT Exhaust Aftermarket 2nd Catalytic Converter $250before: 2006 Chevrolet Express Exhaust Primary Catalytic Converter, Aftermarket $500 each or OEM Grade $650 eachafter: 2006 Chevrolet Express Exhaust Primary Catalytic Converter, Aftermarket $500 each or OEM Grade $650 eachChevrolet Express Exhaust Primary Catalytic Converter, Aftermarket $500 or OEM Grade $650Land Rover →