Catalytic Converter for Infiniti M37 (2011-2013) 3.7L

Direct-Fit Stainless Catalytic Converter Pair for 2011-2013 Infiniti M37 (Y51)

What it Does: This direct-fit left and right catalytic converter pair restores factory exhaust scavenging and emissions conversion on the 2011-2013 Infiniti M37 (Y51) powered by the VQ37VHR 3.7L V6.

The Stock Infiniti M37 Catalytic Converter Failure

On higher-mileage Y51 sedans, the OEM converters bolted to the VQ37VHR 3.7L V6 suffer from severe heat soak and internal ceramic brick degradation. Repeated thermal cycling and unburned fuel or oil vapor cause the factory substrate to fracture, melt, or detach from its retention matting. Once the precious-metal washcoat loses oxygen-storage capacity, downstream O2 sensors detect poor hydrocarbon and CO conversion, triggering P0420/P0430 codes while loose ceramic chunks rattle inside the shell and restrict exhaust flow.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Stored P0420 (Bank 1) or P0430 (Bank 2) codes triggered when downstream O2 sensors mirror upstream exhaust readings.
• Metallic Substrate Rattle: Audible buzzing or rattling beneath the floorpan at idle and deceleration caused by a fractured ceramic brick vibrating inside the housing.
• Excessive Exhaust Backpressure: Sluggish throttle response, reduced high-RPM power, and failed emissions inspections due to melted or plugged honeycomb passages.

The Direct-Fit Stainless Exhaust Solution

Engineered as a complete left-and-right bank replacement, this converter set pairs corrosion-resistant stainless steel shells and tubing with a high-flow ceramic honeycomb substrate coated in precious-metal catalysts. Factory-spec flanges, welded brackets, and integrated O2 sensor bungs replicate original Y51 exhaust geometry for a true bolt-on fit with zero cutting or welding. The EPA-compliant washcoat restores proper HC, CO, and NOx conversion while eliminating exhaust restriction and clearing catalyst-efficiency faults on federal-emissions vehicles.

What's Included

• 2 x Catalytic Converter (Left and Right Bank)
• 2 x Flange Gasket
• 2 x Ring Seal
• Full Mounting Bolt Set

Technical Specifications

Compatibility

• 2011 Infiniti M37 3.7L V6 (Base, Premium, AWD X / M37x)
• 2012 Infiniti M37 3.7L V6 (Base, Premium, AWD X / M37x)
• 2013 Infiniti M37 3.7L V6 (Base, Premium, AWD X / M37x)

Frequently Asked Questions & Fitment Warnings

Does this fit the Y51 M37?

Yes. This is a direct fit for the 2011-2013 Infiniti M37 (Base, Premium, and AWD M37x) equipped with the VQ37VHR 3.7L V6 engine. It does not fit the M56 5.6L V8 or M35h hybrid, and it is not CARB-approved for vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes, if the fault stems from a worn converter; O2 sensors are not included. Installing this new VQ37VHR converter pair restores catalyst efficiency to clear P0420 and P0430 codes, provided you inspect for exhaust leaks and transfer functional sensors or install new ones into the integrated ports.

Are gaskets and mounting hardware included for installation?

Yes. The kit supplies two flange gaskets, two ring seals, and a full bolt set; soak corroded fasteners with penetrating oil on a cold exhaust and torque evenly before checking joints for leaks.

The Infiniti Performance Standard

Built for the Y51 chassis, replacing both banks together restores balanced exhaust scavenging and crisp VQ37VHR throttle response. You get quiet, leak-free operation and reliable OBD-II readiness without dealer assembly pricing.