Quicksilver - Dry Joint Exhaust Manifold MerCruiser V6 Series Coated Cast Iron 864612T01. Overview. There's a special kind of confidence that comes from hearing your MerCruiser V6 settle into a smooth, even idle. It's the sound of everything working together - exhaust, cooling, fuel, timing - all balanced and steady. When a manifold ages, you can feel that balance start to slip. A new, properly fitted exhaust manifold brings it right back. This Mercury Marine part has that reassuring weight and