This Upgraded Exhaust Manifold Kit is designed for 2015–2017 Lincoln Navigator models equipped with the 3.5L EcoBoost engine and uses all 11 stud locations for a more secure, even seal against the cylinder head. It replaces factory manifolds suffering from a design flaw where OEM stud locations are underutilized—the cylinder head has threaded holes for 11 exhaust studs, but the OE manifold only utilizes 8 of those locations. Made from high-silicon molybdenum cast iron, these upgraded manifolds are significantly more resistant to thermal warping and cracking, with exhaust runners port-matched and redesigned to increase flow by over 30% compared to stock manifolds.

Fitment

• 2015–2017 Lincoln Navigator — 3.5L EcoBoost V6

Product Details

• Kit Contents: 1x Performance Drivers Side Manifold, 1x Performance Passenger Side Manifold, 16x W712244-S300 Manifold Studs, 16x W701706-S440 Grade 10 Locking Manifold Nuts, Install Manual
• Material: High-silicon molybdenum cast iron
• Stud Coverage: Uses all 11 stud locations for secure, even clamping pressure
• Flow Improvement: Exhaust runners port-matched and redesigned to increase flow by over 30% compared to stock
• OEM Replacement: Replaces Ford OEM part numbers BL3Z-9430-B, BL3Z-9430-D, BL3Z-9431-B, BL3Z-9431-D
• Additional Hardware Required: OEM manifold gaskets and turbine housing gaskets are recommended for installation

Installation

Professional installation is required. This is a direct replacement using factory mounting points, but gasket replacement and proper torque sequencing are critical for preventing exhaust leaks and achieving the full benefit of the upgraded 11-stud design.

Check local emissions regulations before purchase. Professional installation is recommended.

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