{"product_id":"exhaust-manifold-with-hardware-for-mercruiser-3-0l-181-cid-replaces-99798a18-fits-140-3-0-1983-95","title":"Sierra Mercruiser Exhaust Manifold w\/Hardware 18-1956-3","description":"\u003cp\u003eThe Sierra 18-1956-3 is an exhaust manifold with hardware, built for Mercruiser exhaust systems. It is designed to work as part of a complete exhaust manifold assembly, pairing with the correct elbow, riser, gaskets, and mounting hardware to route exhaust gases away from the engine safely and reliably. This manifold is engineered to fit directly with Sierra's 18-1978 manifold elbow and 18-1975-1 manifold riser, both of which are listed by the manufacturer as compatible with this manifold. When installed with the 18-1978 elbow, the assembly uses the 18-2833 elbow gasket and 18-4362 mounting kit; when installed with the 18-1975-1 riser, the assembly uses the 18-2819-1 elbow gasket, 18-8551 mounting hardware, and 18-2748 exhaust boot. This gives installers a clear, documented path to building out a matched exhaust manifold system rather than guessing at compatible parts. At 47 pounds, this is a heavy-duty, full-size manifold intended for direct replacement in Mercruiser exhaust manifold applications. Sourcing a manifold with the correct manufacturer-specified mating parts helps ensure a proper seal and secure mounting, reducing the risk of exhaust leaks or improper fitment that can occur when parts are mixed from unverified sources.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1956-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 47 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371463\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Elbow:\u003c\/strong\u003e 18-1978\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Riser:\u003c\/strong\u003e 18-1975-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElbow Gasket (with 18-1978):\u003c\/strong\u003e 18-2833\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Kit (with 18-1978 elbow):\u003c\/strong\u003e 18-4362\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElbow Gasket (with 18-1975-1 riser):\u003c\/strong\u003e 18-2819-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Hardware (with 18-1975-1 riser):\u003c\/strong\u003e 18-8551\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Boot (with 18-1975-1 riser):\u003c\/strong\u003e 18-2748\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is Sierra part 18-1956-3?\u003c\/strong\u003e It is a Sierra exhaust manifold with hardware, listed under Mercruiser exhaust manifolds, part number 18-1956-3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1956-3 manifold come with mounting hardware?\u003c\/strong\u003e Yes, the 18-1956-3 is sold as an exhaust manifold with hardware included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1956-3 exhaust manifold weigh?\u003c\/strong\u003e The Sierra 18-1956-3 exhaust manifold weighs 47 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich elbow fits the 18-1956-3 manifold?\u003c\/strong\u003e Sierra's 18-1978 manifold elbow is listed as compatible for use with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich riser fits the 18-1956-3 manifold?\u003c\/strong\u003e Sierra's 18-1975-1 manifold riser is listed as compatible for use with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need if I install the 18-1978 elbow with this manifold?\u003c\/strong\u003e Use the 18-2833 elbow gasket when pairing the 18-1978 elbow with the 18-1956-3 manifold; it is included in the 18-4362 mounting kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat gasket do I need if I install the 18-1975-1 riser with this manifold?\u003c\/strong\u003e Use the 18-2819-1 elbow gasket when pairing the 18-1975-1 riser with the 18-1956-3 manifold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat mounting hardware is used with the 18-1975-1 riser on this manifold?\u003c\/strong\u003e The 18-8551 hardware kit provides the mounting hardware for the 18-1975-1 riser used with the 18-1956-3 manifold, and the 18-2748 exhaust boot is used with that same riser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-4362 mounting kit?\u003c\/strong\u003e The 18-4362 mounting kit, used with the 18-1978 elbow on the 18-1956-3 manifold assembly, includes the 18-2833 elbow gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the UPC for the 18-1956-3 exhaust manifold available?\u003c\/strong\u003e Yes, the Sierra 18-1956-3 exhaust manifold carries UPC 808282371463.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category does the 18-1956-3 fall under?\u003c\/strong\u003e The 18-1956-3 is categorized as a Mercruiser exhaust manifold by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to buy the elbow and riser separately from the 18-1956-3 manifold?\u003c\/strong\u003e Yes, the 18-1956-3 is the manifold itself; the 18-1978 elbow or 18-1975-1 riser, along with their respective gaskets and mounting hardware, are separate parts documented as compatible with this manifold.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089385179,"sku":"SIE-18-1956-3","price":575.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1956-3__20950.1737824252.500.750.jpg?v=1785329169","url":"https:\/\/www.goodvibesmarina.com\/products\/exhaust-manifold-with-hardware-for-mercruiser-3-0l-181-cid-replaces-99798a18-fits-140-3-0-1983-95","provider":"Good Vibes Marina","version":"1.0","type":"link"}