REAR MANIFOLD UNIT item bolts to cylinder head ( not included) 2 bolt outlet flange item has 2 O2 sensor provisions , see picture 02 sensor not included item is direct fit, no cutting or welding required original heat shields not required with this unit converter features a ceramic core with high concentration of precious metals manufactured by a leading converter manufacturer in USA and 100% EPA approved no cutting or welding required, this is a direct fit unit, simply bolt in place of original item EVERYTHING SHOWN IN PICTURE IS INCLUDED