Sierra Marine 18-5983 Sierra Marine Alternators Bumpers Using OEM-quality marine components is

Using OEM-quality marine components is critical for reliability on the water

while the engineered intake tube delivers higher velocity airflow to the throttle body compared to the stock plumbing

Compatible with factory and aftermarket exhaust systems

0-inch mandrel-bent 14-gauge mandrel-bent steel with a high-flow straight-through or chambered muffler section depending on the intended sound profile

Sierra Marine 18-5983 Sierra Marine Alternators Bumpers Using OEM-quality marine components isThe Sierra Marine 18 5983 Sierra Marine Alternators is a marine grade alternator built for demanding saltwater and freshwater applications. It meets SAE J1171 marine ignition protection standards and delivers reliable charging in corrosive environments where standard automotive alternators fail prematurely. Designed as a direct replacement for MerCruiser and OMC marine propulsion systems, it provides consistent output for batteries and electronics.