Catalytic Converter for Infiniti QX50 QX70 (2014-2017) 3.7L

Direct-Fit Catalytic Converters for 2014-2017 Infiniti QX50,QX70 (J50 / S51)

What it Does: Replaces both factory catalytic converters on 2014-2017 Infiniti QX50 (J50) and QX70 (S51) VQ37VHR 3.7L V6 models to restore exhaust flow and emissions compliance.

The Stock Infiniti QX50,QX70 Catalytic Converter Failure

Over repeated thermal cycles on the J50 and S51 chassis, OEM ceramic substrates behind the high-output VQ37VHR 3.7L V6 suffer severe heat soak and thermal shock. Unburned fuel from minor ignition misfires overheats the precious-metal washcoat, fracturing the brittle internal monolith. Dislodged fragments choke exhaust flow, spike backpressure, and trigger persistent P0420 and P0430 catalyst-efficiency codes.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light: Triggers P0420 or P0430 codes from degraded HC, CO, and NOx conversion.
• Substrate Rattle: Metallic rattling under load from fractured ceramic honeycomb inside the shell.
• Power Loss: High backpressure chokes upper-RPM breathing and fails emissions tests.

The Direct-Fit Stainless Catalytic Converter Solution

This 2-piece assembly (16478, 16479, INFT001002) replaces both banks using stainless steel bodies and piping that resist rust and heat cracking. Each converter pipe integrates two ceramic honeycomb catalyst stages with a precious-metal washcoat, a post-catalyst O2 sensor port, and factory flanges (8-inch body length, 5-inch height) for leak-free, bolt-on installation without cutting or welding.

What's Included

• 2 x Catalytic Converter Pipes (Pair)
• 2 x Ring Gaskets
• 2 x 2-Bolt Flange Gaskets

Technical Specifications

Compatibility

• 2014-2017 Infiniti QX50 (Base, Journey) — 3.7L V6
• 2014-2017 Infiniti QX70 (Base, Sport, Seduction) — 3.7L V6

Frequently Asked Questions & Fitment Warnings

Does this fit the J50 / S51 QX50,QX70?

Yes. Fits 2014-2017 QX50,QX70 VQ37VHR 3.7L V6 models. Excludes 5.0L V8; EPA federal only (not legal in CA, NY, CO, ME).

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

Yes, if worn converters caused the fault; O2 sensors are excluded. Transfer existing sensors and verify zero exhaust leaks.

Are gaskets included for installation?

Yes. Ring and flange gaskets are included; soak old studs with penetrating oil and torque evenly.

The Infiniti Precision Standard

Tuned for VQ37VHR 3.7L V6 scavenging, this converter pair restores throttle response and rattle-free emissions compliance.