This is a Direct Replacement Front Pipe Catalytic Converter for Ford E150, E250, and E350 models with 5.4L and 6.8L engines manufactured between 2004 and 2008. It is made of Aluminized Steel and is designed to be placed on the lower side of the exhaust system, in front of the catalyst. The product is EPA certified and is easy to replace. The OE part number 4C2Z-5246-AA.