Magnaflow Direct Fit OEM Underbody Converter

2005–2010 Chrysler 300 / 2007–2010 Dodge Charger / 2005–2008 Dodge Magnum

21-540

Overview:

The Magnaflow Direct Fit OEM Underbody Converter is a high-quality replacement catalytic converter designed specifically for select Chrysler and Dodge models. Engineered to meet or exceed Federal emissions standards, this converter ensures your vehicle remains compliant with EPA regulations while maintaining optimal engine performance. Ideal for owners of 2005–2010 Chrysler 300, 2007–2010 Dodge Charger, and 2005–2008 Dodge Magnum models, this direct-fit converter helps keep your check engine light off by restoring proper emissions control.

With a focus on precision fitment and durability, this catalytic converter offers a hassle-free installation experience without the need for cutting or welding. It is perfect for enthusiasts and professional installers seeking a reliable, OEM-grade replacement that preserves factory performance and fuel efficiency.

Key Features:

This Magnaflow catalytic converter combines advanced manufacturing techniques with durable materials to deliver dependable performance and long service life. Key features include:

• Federal/EPA compliant design for OBDII federally registered vehicles
• Direct-fit application requiring no cutting or welding
• Mandrel-bent tubing that retains OEM-like flow geometry for smooth exhaust flow
• Highly corrosion-resistant 16 gauge 409 stainless steel tubing
• Spun body construction replicating original equipment design
• Single laser fusion weld to minimize leak potential
• Compact, low-mass design for improved thermal efficiency
• Includes essential gaskets and hardware for simplified installation
• Interchanges with OE part numbers 4581 753AE and 4578 359AA
• Manufactured using state-of-the-art 3D scanning for precise fit and function

Construction & Design:

Crafted from high-strength 16 gauge 409 stainless steel, this catalytic converter is built to withstand the harsh conditions of underbody exhaust environments. The mandrel-bent tubing preserves the original exhaust flow path, ensuring minimal restriction and maintaining factory engine efficiency. The spun body design mirrors the OEM converter’s shape and dimensions, while the single laser fusion weld enhances structural integrity and reduces the risk of leaks.

Magnaflow’s advanced metrology process employs cutting-edge 3D scanning technology during research and development, guaranteeing that each converter fits precisely and functions as intended. This meticulous engineering results in a durable, long-lasting component that meets stringent emissions requirements without compromising performance.

Installation & Fitment:

Designed as a direct-fit replacement, the Magnaflow converter installs easily using standard automotive tools. No cutting, welding, or modifications to the vehicle’s exhaust system are necessary, making it an ideal choice for DIY installers and professional mechanics alike. The included hardware and gaskets simplify the replacement process, even when dealing with corroded factory components.

This converter fits the following vehicles:

• Chrysler 300 Limited (2005–2010)
• Chrysler 300 S (2010)
• Chrysler 300 Signature Series (2009)
• Chrysler 300 Touring (2005–2010)
• Dodge Charger SE (2007–2010)
• Dodge Charger SXT (2007–2010)
• Dodge Magnum SE (2007)
• Dodge Magnum SXT (2005–2008)

What's Included:

• Magnaflow Direct Fit OEM Underbody Catalytic Converter (Part #21-540)
• Essential installation gaskets
• Mounting hardware for secure fitment
• Installation instructions

Ideal For:

This catalytic converter is ideal for vehicle owners and mechanics seeking a reliable, EPA-compliant replacement part that maintains factory emissions control and engine performance. It suits those who want a straightforward installation without the need for exhaust system modifications, ensuring legal compliance and preventing check engine light issues.

Emissions Note

This Magnaflow catalytic converter is designed to meet or exceed Federal emissions requirements set by the EPA. It is compliant with OBDII federally registered vehicles equipped with California or Federal/EPA emission systems, providing assurance of genuine emissions compliance for legal road use.

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.