The alloy manifold was never used on the mondeo. Yours is from a 115ps 1.8 as it says SO on the back. They did a HO for the 130ps in the rs and xr3i's ect. these have bigger ports and a 2L size Tb and fetch good money as there arnt that many about. There is another without the So or Ho stamp and they where fitted to the 105 ps 1.8 and the 1.6 engines.
What engine managment are you using ? it will run reall nice on the ford one
