Catalytic Converter for Ford Mustang (2015-2017) 3.7L

Direct-Fit Catalytic Converters for 2015-2017 Ford Mustang (S550)

What it Does: This left and right catalytic converter pair replaces failed front units on the 2015-2017 Ford Mustang S550 3.7L Cyclone V6 to restore emissions control and flow.

The Stock Ford Mustang Catalytic Converter Failure

On the S550 chassis with the 3.7L Cyclone V6, factory front converters endure severe thermal cycling near the exhaust manifolds. Repeated heat soak and unburned fuel degrade the precious-metal washcoat and fracture the ceramic brick, triggering P0420 or P0430 efficiency codes. Broken substrate chunks also rattle inside the shell or lodge downstream, creating excessive backpressure and sluggish throttle response.

Common Symptoms of a Failing OEM Catalytic Converter

• DTCs: P0420/P0430 codes from depleted catalyst efficiency.
• Rattle: Metallic noise from a fractured ceramic core.
• Backpressure: Clogged brick causing power loss and failed emissions.

The Direct-Fit Stainless Exhaust Solution

This complete Bank 1 and Bank 2 pair (EXL0743321-1/2) uses corrosion-resistant stainless steel tubing and 8x5x4-inch housings to prevent heat cracking. Inside, a high-flow ceramic honeycomb substrate with precious-metal washcoat converts HC, CO, and NOx for OBD-II compliance. Precision-bent pipes, factory flanges, integrated O2 sensor ports, and mid-pipe clamps deliver bolt-on installation with zero cutting or welding.

What's Included

• 2 x Direct-Fit Catalytic Converters (Left and Right, with O2 sensor ports)
• 2 x Exhaust Clamps

Technical Specifications

Compatibility

• 2015, 2016, 2017 Ford Mustang Base 3.7L V6 (Coupe and Convertible)

Frequently Asked Questions & Fitment Warnings

Does this fit the S550 Mustang?

Yes. Direct fit for the 2015-2017 Ford Mustang 3.7L Cyclone V6. Excludes 2.3L EcoBoost and 5.0L V8; EPA federal only—not CARB legal in CA, NY, CO, or ME.

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

Yes, if caused by worn converters. Replacing both banks restores catalyst efficiency; inspect for exhaust leaks too. Transfer existing O2 sensors or install new units.

Are mounting clamps and gaskets included for installation?

Two mid-pipe clamps are included; gaskets are not. Soak fasteners with penetrating oil, install new flange gaskets, torque evenly, and inspect for leaks.

The Ford Performance Standard

Built for the S550 platform, these converters eliminate broken cores to restore throttle response and balanced V6 exhaust flow.