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This Exhaust Manifold (header) makes a 120° bend for routing exhaust outside the cowling or fuselage on a radio controlled airplane. This header is designed to fit the O.S. FS70 & FS91 Surpass series engines. INCLUDES: One 120° chromed exhaust manifold (Has male threaded portion on one end & female threads on the other) One hex nut SPECS: Male End Thread Pitch -0.75mm Outside Diameter-0.425"(10.8mm) Inside Diameter-0.320"(8.1mm ) Female End (exhaust connection) Thread Pitch -0.75mm Outside Diameter-0.509"(12.9mm) Inside Diameter-0.408"(10.3mm) === Inside Exhaust Pipe Connector Outside Diameter-0.509"(10.3mm) Inside Diameter-0.409"(10.3mm) Thread Depth -0.424"(10.7mm) jct4/7/00