Quicksilver - Exhaust Manifold Kit MerCruiser 3.0L Engines Cast Iron Coated Finish 860235A03. Overview. If you've ever pulled an old exhaust manifold off a sterndrive, you know how important a solid replacement really is. It's not glamorous work, but it's the kind of maintenance that keeps your boat running strong for years. This Quicksilver exhaust manifold kit brings back that sense of reassurance - the feeling that your engine is breathing the way it should and that you're setting it up for l