{"product_id":"headers-kit-for-lincoln-navigator-mark-lt-ford-expedition-2015-2017-3-5l-ecoboost","title":"Headers Kit for Lincoln Navigator Mark LT \u0026 Ford Expedition (2015-2017) 3.5L Ecoboost","description":"\u003ch2\u003eUpgraded Headers Kit for 2015-2017 Lincoln, Ford Navigator, Expedition\u003c\/h2\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the structurally deficient factory exhaust manifolds with thicker-walled 304 stainless steel units utilizing all 11 stud locations to prevent thermal warping and exhaust leaks.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Stock Navigator, Expedition Thermal Weakness\u003c\/h3\u003e\n  \u003cp\u003eThe OEM Ford 3.5L EcoBoost exhaust manifolds suffer from a documented engineering flaw regarding thermal management and clamping force. Although the 3.5L cylinder head features 11 threaded holes for exhaust studs, the factory manifolds are designed to only utilize 8 of these locations. Under heavy load and the high exhaust gas temperatures (EGTs) inherent to turbocharged applications, the unequal thermal expansion causes the thin-walled OEM cast manifolds to warp. This loss of structural integrity leads to shearing of the exhaust studs, blown manifold gaskets, and severe exhaust leaks before the turbos, resulting in poor spool-up and drivability issues.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n  \u003cp\u003eDoctor Diesel USA addresses this failure point by utilizing all 11 factory stud locations to ensure even clamping pressure across the entire mating surface. The redesigned manifolds are constructed from heavy-duty, thick-walled 304 stainless steel, vastly superior at resisting the thermal deformation caused by sustained high EGTs. Additionally, the internal runner geometry is optimized to improve exhaust flow into the turbos. To further combat heat soak and expansion stress, each kit includes 22 class 8.8 exhaust studs that are 15mm longer than stock, paired with custom exhaust spacers. This mechanical arrangement acts as a thermal buffer, allowing the manifold to expand and contract freely without exerting shear forces on the studs.\u003c\/p\u003e\n  \n  \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2015-2017 Lincoln, Ford Navigator, Expedition\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e3.5L EcoBoost V6 \/ U324 \u0026amp; U326\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e365-380 hp \/ 420-460 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eReplaces BL3Z-9430-B, BL3Z-9430-D, BL3Z-9431-B, BL3Z-9431-D\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e2011-2016 Ford F150 w\/ 3.5L Eco-Boost\u003c\/li\u003e\n    \u003cli\u003e2015-2024 Ford Transit w\/ 3.5L Eco-Boost\u003c\/li\u003e\n    \u003cli\u003e2011-2014 Ford Expedition w\/ 3.5L Eco-Boost\u003c\/li\u003e\n    \u003cli\u003e2011-2014 Lincoln Mark LT w\/ 3.5L Eco-Boost\u003c\/li\u003e\n    \u003cli\u003e2015-2017 Lincoln Navigator w\/ 3.5L Eco-Boost\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eThe Ford and Lincoln Durability Standard\u003c\/h3\u003e\n  \u003cp\u003eWhether towing heavy loads or commuting under strenuous conditions, this comprehensive manifold and stud upgrade restores lost turbo efficiency and ensures reliable, leak-free operation for your EcoBoost under the most demanding driving scenarios.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48634779861240,"sku":"DS-E9M4MWQDA","price":449.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/headers-kit-for-lincoln-navigator-mark-lt-ford-expedition-2015-2017-3-5l-ecoboost-1.webp?v=1779916002","url":"https:\/\/performancechiptuning.com\/fr\/products\/headers-kit-for-lincoln-navigator-mark-lt-ford-expedition-2015-2017-3-5l-ecoboost","provider":"Performance Chip Tuning","version":"1.0","type":"link"}