New exhaust manifold and riser kit for MerCruiser small block marine gas engines with dry-joint style exhaust (2004 and newer, 5.0L, 5.7L, 6.2L) Does not replace older manifolds, log style manifolds, or 14 degree down-angle risers. Comes with gaskets and hardware.

Kit includes parts to configured for both Raw and Fresh Water Cooling Systems. Marine Power high performance semi-tuned aluminum exhaust manifold and riser kit. Fits 5.0L/305ci and 5.7L/350ci engines. Includes: (2) Manifolds, (2) Risers, Riser to Manifold Gaskets and hardware. Exhaust comes unpainted ready for primer and paint.

Marine Power high performance semi-tuned aluminum exhaust manifold and riser kit. Fits 6.0L, 6.2L (LS3 and LSA) GM LS engines. Exhaust comes unpainted ready for primer and paint. Image shown with painted system. Includes: (2) Manifolds, (2) Risers, Riser to Manifold Gaskets and hardware.

Mercruiser style exhaust manifold and riser kit. Fits GM big block (V8) 454-502 cubic inch. Replaces: Mercruiser 89011A8 and Mercruiser B-44354A3.

Marine Power high performance semi-tuned aluminum exhaust manifold and riser kit. Fits 7.4L / 454cid - 8.2L / 502 CID Big Block Chevy Engines . Can be used with fresh water or raw water cooling systems.

Sierra Manifold Conversion Kit, Part Number 18-1987. Convert Mercruiser stern drive engines to newer more efficient center rise manifolds. Includes: 2 Center Rise Manifolds; 2 Exhaust Elbows; 1 Thermostat housing; 1 Thermostat; 1 Thermostat cover.