MagnaFlow 551143 Catalytic Converter - Left

California OBDII Direct-Fit Converter

MagnaFlow 551143 is a California Grade, CARB-compliant direct-fit catalytic converter built for specific Infiniti and Nissan applications. It is engineered to help keep the check engine light off while matching OE-style fitment for a straightforward replacement on the left side.

• Direct-fit design for specific vehicle applications
• California Grade CARB-compliant construction for listed vehicles
• Stainless steel body and tubing for corrosion resistance
• Ceramic substrate with bolt-on inlet and outlet connections
• Heat shield attached for added thermal management
• Included mounting hardware and hangers help simplify installation
• Post-converter oxygen sensor location
• OE-style spun body design with laser fusion weld to reduce leak points

MagnaFlow Direct-Fit CALIFORNIA OBDII Converters

This part is from MagnaFlow’s Direct-Fit CALIFORNIA OBDII CONVERTERS line, which focuses on emissions replacement parts built for specific applications and California compliance requirements. MagnaFlow 551143 uses 3D scanning during development to match original equipment dimensions and function, and its compact, low-mass design supports thermal efficiency in the exhaust stream.

Compatible With 2007-2013 Infiniti G35, G37, EX37, M37, and 2007-2013 Nissan 350Z and 370Z left-side applications, this converter is also listed for 2014-2018 Nissan 370Z, 2014-2015 Infiniti Q40, Q50, Q60, Q70, Q70L, and QX50 left-side applications. MagnaFlow 551143 is a direct replacement for drivers needing a CARB-compliant catalytic converter for California and other CARB-restricted states on the listed vehicles.

What This Converter Helps Address

• Check engine light concerns related to catalytic converter efficiency
• Failed emissions testing on listed California-compliant applications
• Corrosion damage to the original converter housing or tubing
• Exhaust leaks at worn factory connection points
• Fitment issues from using a non-direct replacement part

Installation Notes and Tips

Fits 2007-2018 Nissan 370Z, left; 2007-2008 Infiniti G35, left; 2008-2013 Infiniti G37, left; and additional listed Infiniti applications on the left side. Installation is bolt-on and does not require cutting or welding when used on the correct application. Verify engine family and CARB Executive Order details before installation, and confirm the post-converter oxygen sensor location matches the vehicle configuration.

Quality Assurance

MagnaFlow 551143 is built with stainless steel construction, a ceramic substrate, and OE-style design validation using 3D scanning and metrology-based development. It is tested to meet CARB guidelines for legal use in California and other CARB-restricted states on the listed vehicles.