Sierra 18-1932 ManifoldSierra replacement exhaust Manifold for V6 Volvo Marine engines. Port and Starboard sides. Material: Cast iron; Use with: 18-2909: Exhaust Manifold Gasket; 18-1936: Riser; 18-2909-9: Exhaust Manifold Gasket (Priced Per Pkg of 2); 18-2971: Exhaust Manifold Gasket; Interchangeable with: GLM; 51640; HGE; 6894; Volvo Penta; 856894;