This Exhaust Manifold (header) makes a 120° bend for routing exhaust outside the cowling on a radio controlled airplane. This header is designed to fit the O.S. FS120S-E II Surpass series engines. INCLUDES: One 120° chromed exhaust manifold (Has male threaded portion on one end & female threads on the other) One hex nut JAL 5/13/98up ir/jl