MagnaFlow Direct-Fit OEM Underbody Catalytic Converter

Ram 1500 / 3500 12-18 5.7L Hemi, Ram 2500 12-19 6.4L/5.7L

21-457

Overview:

The MagnaFlow Direct-Fit OEM Underbody Catalytic Converter 21-457 is engineered to provide a seamless replacement for your Ram truck’s factory catalytic converter. Designed specifically for the 2012 Ram 1500, 2012–2019 Ram 2500, and 2013–2018 Ram 3500 models, this converter ensures your vehicle remains compliant with Federal and EPA emissions standards while maintaining optimal engine performance. Ideal for truck owners seeking a reliable, high-quality replacement part, this direct-fit converter helps keep the check engine light off and supports smooth exhaust flow without the need for cutting or welding during installation.

Whether you are a professional mechanic or a knowledgeable DIY enthusiast, this catalytic converter offers a straightforward installation experience with a perfect fit guaranteed by advanced 3D scanning technology used in its design and development.

Key Features:

MagnaFlow’s Direct-Fit Catalytic Converter combines precision engineering with durable materials to deliver dependable performance and long-lasting service life. Key features include:

• Federal/EPA compliant design meeting or exceeding emissions requirements for OBDII federally registered vehicles
• Mandrel-bent tubing to eliminate flow restrictions and maintain OEM-like exhaust geometry
• Highly corrosion-resistant stainless steel construction for durability and longevity
• Single laser fusion weld on the spun body design to minimize leak potential
• Compact, low-mass design for improved thermal efficiency and quicker catalyst light-off
• OE-sized barbed exhaust hangers made from corrosion-resistant 410 stainless steel to reduce noise and vibration
• Precision stamped collector design optimized for exhaust flow, engine efficiency, and fuel economy
• Torca AccuSeal® exhaust clamps providing 360-degree clamping force to prevent pipe distortion and ensure a complete seal
• Includes essential gaskets and hardware for a complete, hassle-free installation

Construction & Design:

This catalytic converter is crafted from high-strength 16 gauge 409 stainless steel tubing, offering exceptional corrosion resistance and maximum service life. The spun body design replicates the original equipment manufacturer’s flow dynamics, ensuring factory-level performance and fuel efficiency are maintained. Durable 308 stainless steel MIG welds and mandrel-bent tubing preserve the OEM-like geometry, preventing exhaust flow restrictions and promoting optimal engine operation.

MagnaFlow’s state-of-the-art metrology department utilizes advanced 3D scanning systems during research and development to ensure precise fitment and function. The single laser fusion weld on the converter body reduces the risk of leaks, while the compact design enhances thermal efficiency for quicker catalyst activation.

Installation & Fitment:

The MagnaFlow Direct-Fit Catalytic Converter is designed for a straightforward, bolt-on installation with no cutting or welding required when using the proper tools. It fits the following Ram models:

• 2012 Ram 1500 Tradesman HD
• 2012–2019 Ram 2500 Big Horn, Laramie, Laramie Limited (2014–2015), Laramie Longhorn, Limited (2016–2019), Lone Star (2013–2015, 2019), Outdoorsman (2012–2016), Power Wagon (2012–2014, 2017–2019), SLT (2012–2018), ST (2012–2013), Tradesman (2013–2019)
• 2013–2018 Ram 3500 Big Horn, Laramie, Laramie Limited (2014–2015), Laramie Longhorn, Limited (2016–2017), Lone Star (2013–2015, 2017), SLT (2013–2018), ST (2013), Tradesman (2013–2018)

This converter also interchanges with OE part numbers 6814 9940AC, 6814 9940AB, 5212 2260AH, and 5212 2260AG, ensuring compatibility with original equipment specifications.

What's Included:

• MagnaFlow Direct-Fit OEM Underbody Catalytic Converter 21-457
• Torca AccuSeal® exhaust clamps for secure sealing
• Essential gaskets and hardware for installation

Ideal For:

This catalytic converter is ideal for Ram truck owners who require a reliable, EPA-compliant replacement part that maintains factory performance and emissions standards. It suits those performing routine exhaust system repairs or upgrades and anyone seeking a direct-fit solution that simplifies installation without sacrificing quality or durability.

Emissions Note

This MagnaFlow catalytic converter is designed to meet or exceed Federal emissions requirements set forth by the EPA. It is compliant with legal standards for OBDII federally registered vehicles equipped with California or Federal/EPA emission systems, ensuring your vehicle remains street-legal and environmentally responsible.

MagnaFlow is a performance exhaust manufacturer best known for cat‑back and axle‑back systems, mufflers, and catalytic converters engineered for quality sound and improved flow. Their vehicle-specific exhaust options span muscle, import, and truck applications—making MagnaFlow a staple upgrade when you want a deeper tone, cleaner fitment, and a proven performance-focused exhaust setup.