OMC Exhaust Boot | Sierra 18-2745OMC Exhaust Boot Sierra 18 2745 Rubber exhaust hose connects exhaust manifold outlet to exhaust pipe on various OMC marine engines. Fits OMC Ford 7. 5L marine engines in 1987 Fits OMC Ford 5. 0L and 5. 8L marine engines from 1989 1990 Fits OMC GM 5. 0L and 5. 7L marine engines from 1986 later 3 1 2 in. inlet 4 1 2 in. outlet 4 5 8 in. long Replaces Mercury 8790351 Replaces OMC 912374 Replaces Mallory 9 72806