MarineTorq Stainless Steel Manifolds are a lightweight, custom made, one-piece construction for both petrol and diesel inboard boat engines. Our unique design eliminates leaks and increases boat performance. Every manifold and riser is manufactured using premium marine-grade stainless steel and fabricated and hand welded by highly trained and experienced staff. We specialize in stainless steel manifolds for Mercruiser, Volvo Penta, BMW, Chevrolet, Yanmar and more.