{"product_id":"sierra-18-1957-2-exhaust-manifold-replaces-mercruiser-807078a6-89011a8-gm-big-block-v8-454-cu-in-7-4l-models-330-340","title":"Sierra 18-1957-2 Exhaust Manifold for Mercruiser Stern Drive Engines (Replaces 89011A8)","description":"\u003cp\u003eThe Sierra 18-1957-2 is an exhaust manifold built for Mercruiser stern drive engines, designed to move spent exhaust gases away from the engine and into the exhaust elbow and riser system while keeping the engine bay running cool and dry. It is manufactured to meet or exceed original equipment quality, giving boat owners a direct, no-compromise replacement for a worn, cracked, or corroded factory manifold. The 18-1957-2 is finished in white and will fit either the port or starboard side of the engine, so it works whichever side needs replacing.\u003c\/p\u003e\u003cp\u003eThis manifold pairs with Sierra's related riser and spacer components, including the 18-1908K manifold spacer kit, which is specifically listed as compatible with the 18-1957-2 and includes spacers, a restrictor, gaskets, and mounting hardware for a complete riser installation. Buyers replacing a manifold on a Mercruiser stern drive engine can order the 18-1957-2 directly using its own part number or any of its Mercruiser OEM cross-reference numbers.\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 18-1957-2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282371357\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 47.55 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 20.25 x 9.75 x 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Side:\u003c\/strong\u003e Fits either port or starboard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Manifold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Accessory:\u003c\/strong\u003e 18-1908K Manifold Spacer Kit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser stern drive engines\u003c\/li\u003e\n\u003cli\u003eFits either port or starboard side\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercruiser 89011A8\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A6\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078T10\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078T09\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A4\u003c\/li\u003e\n\u003cli\u003eMercruiser 807078A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1957-2 manifold fit?\u003c\/strong\u003e The 18-1957-2 is built for Mercruiser stern drive engines and can be installed on either the port or starboard side.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this manifold for port or starboard?\u003c\/strong\u003e The Sierra 18-1957-2 fits either port or starboard, so the same part number works on both sides of the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat Mercruiser OEM numbers does the 18-1957-2 replace?\u003c\/strong\u003e It replaces Mercruiser 89011A8, 807078A6, 807078T10, 807078T09, 807078A4, and 807078A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1957-2 exhaust manifold weigh?\u003c\/strong\u003e It weighs 47.55 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1957-2 manifold?\u003c\/strong\u003e The packaged dimensions of the Sierra 18-1957-2 manifold are 20.25 x 9.75 x 7 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-1957-2 manifold?\u003c\/strong\u003e The Sierra 18-1957-2 exhaust manifold is finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1957-2 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket manifold made to meet or exceed original equipment quality, sold under Sierra's own part number 18-1957-2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1957-2 come with mounting hardware or gaskets?\u003c\/strong\u003e The manifold itself includes only the manifold; mounting hardware and gaskets for the riser connection are supplied separately in the 18-1908K manifold spacer kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the box with this manifold?\u003c\/strong\u003e The Sierra 18-1957-2 ships as a single manifold unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-1908K spacer kit be used with the 18-1957-2 manifold?\u003c\/strong\u003e Yes, the 18-1908K manifold spacer kit is specifically listed as compatible with the 18-1957-2 and includes spacers, a restrictor, gaskets, and mounting hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the Sierra 18-1957-2 different from a used or reconditioned manifold?\u003c\/strong\u003e The 18-1957-2 is a new manifold manufactured to meet or exceed original equipment quality, rather than a rebuilt or salvaged unit.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089549019,"sku":"SIE-18-1957-2","price":345.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__56703.1753840675.500.750.jpg?v=1785188469","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1957-2-exhaust-manifold-replaces-mercruiser-807078a6-89011a8-gm-big-block-v8-454-cu-in-7-4l-models-330-340","provider":"Good Vibes Marina","version":"1.0","type":"link"}