MagnaFlow 5531218 Catalytic Converter with Integrated Exhaust Manifold - Front or Front Left

California Grade Direct-Fit Converter

MagnaFlow 5531218 is a California Grade CARB-compliant direct-fit catalytic converter with integrated exhaust manifold design for specific Ford and Lincoln applications. It is built with stainless steel construction, a ceramic substrate, and a spun body layout to match OE-style fitment and exhaust flow characteristics.

Fits 2013-2015 Ford Flex, front left, and 2011-2012 Lincoln MKS, front. It also fits 2011-2012 Lincoln MKT, front. This part number, 5531218, is engineered for vehicles that require a CARB-certified replacement in California and other CARB-restricted states.

Key Features

• Direct-fit catalytic converter with integrated exhaust manifold configuration
• Stainless steel converter body and tubing for corrosion resistance
• Ceramic substrate material
• Spun body design with a single laser fusion weld to reduce leak points
• Mandrel-bent tubing for freer exhaust flow
• Pre- and post-converter oxygen sensor locations
• Bolt-on inlet and outlet connections
• CARB-certified for listed applications in California and CARB-restricted states

Detailed Description

MagnaFlow California Converters 5531218 is built to replace the original exhaust manifold and catalytic converter assembly on select Ford Flex, Lincoln MKS, and Lincoln MKT models. MagnaFlow uses 3D scanning during development to replicate OE dimensions, helping the part align with factory mounting points and exhaust routing. The compact, low-mass design supports thermal efficiency, while the stainless steel construction helps resist corrosion in demanding underbody conditions.

This MagnaFlow 5531218 replacement is designed for 2013-2015 Ford Flex front left applications and 2011-2012 Lincoln MKS and Lincoln MKT front applications. It is a direct-fit solution for drivers needing a CARB-compliant catalytic converter replacement that matches the original equipment style and sensor layout.

What It Helps Address

• Check engine light caused by catalytic converter efficiency faults
• Failed emissions inspection related to converter performance
• Exhaust leaks at the manifold/converter assembly
• Corrosion damage on the factory exhaust manifold and converter unit
• Fitment issues from worn or damaged OE exhaust components

Installation Notes

Use the proper tools and follow factory service procedures for installation. This direct-fit design does not require cutting or welding. Verify sensor placement, flange alignment, and vehicle-specific emissions requirements before installation. Fits 2013-2015 Ford Flex, front left; 2011-2012 Lincoln MKS, front; and 2011-2012 Lincoln MKT, front.

Quality Assurance

MagnaFlow 5531218 is certified to meet California Air Resources Board requirements for the listed vehicles and has undergone additional testing for legal use in CA and CARB-restricted states. This part cross-references OE-style replacement applications for the same vehicle coverage.