Headers Kit for Lincoln Navigator Mark LT & Ford Expedition (2015-2017) 3.5L EcoboostUpgraded Headers Kit for 2015 2017 Lincoln, Ford Navigator, Expedition What it Does: 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. The Stock Navigator, Expedition Thermal Weakness The OEM Ford 3. 5L EcoBoost exhaust manifolds suffer from a documented engineering flaw regarding thermal management and clamping
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Headers Kit for Lincoln Navigator Mark LT & Ford Expedition (2015-2017) 3.5L Ecoboost