Magnaflow Direct Fit Catalytic Converter

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

21-539

Overview:

The Magnaflow Direct Fit Underbody Converter is a premium replacement catalytic converter engineered specifically for select Chrysler and Dodge models, including the 2005–2010 Chrysler 300, 2007–2010 Dodge Charger, and 2005–2008 Dodge Magnum. Designed to meet or exceed Federal EPA emissions standards, this converter helps keep your vehicle’s check engine light off while maintaining optimal engine performance and fuel efficiency. It is an ideal solution for drivers seeking a reliable, OEM-grade catalytic converter that installs easily without the need for cutting or welding.

Crafted with precision and durability in mind, this direct-fit converter replicates the original equipment’s design and flow characteristics, ensuring a seamless fit and consistent operation. Whether you are replacing a faulty converter or upgrading your exhaust system, the Magnaflow 21-539 offers a dependable, long-lasting solution that complies with federal emissions regulations.

Key Features:

Magnaflow’s Direct Fit Catalytic Converter combines advanced manufacturing techniques with high-quality materials to deliver superior performance and durability. Key features include:

• OEM-grade Federal/EPA compliant catalytic converter designed for direct fitment
• Free-flowing mandrel-bent tubing that preserves OEM-like exhaust flow and geometry
• Highly corrosion-resistant 16 gauge 409 stainless steel construction for extended service life
• Spun body design with a single laser fusion weld to minimize leaks and enhance thermal efficiency
• Compact, low-mass design that improves heat retention and catalytic activity
• Includes all necessary hardware and gaskets for a hassle-free installation
• Engineered using state-of-the-art 3D scanning technology to ensure precise fit and function
• Interchanges with OE part numbers 4581 752AD and 4578 358AA
• Compatible with OBDII federally registered vehicles equipped with California or Federal/EPA emission systems

Construction & Design:

This catalytic converter is expertly crafted from high-strength 16 gauge 409 stainless steel tubing, chosen for its excellent corrosion resistance and durability under harsh exhaust conditions. The mandrel-bent tubing maintains the original equipment’s flow dynamics, ensuring smooth exhaust gas passage and preventing restrictions that could reduce engine efficiency.

The spun body design is replicated with precision, featuring a single laser fusion weld that significantly reduces the risk of leaks compared to traditional welds. This design also contributes to a more compact and thermally efficient converter, allowing it to reach optimal operating temperatures faster and maintain catalytic performance over time.

Installation & Fitment:

The Magnaflow Direct Fit Underbody Converter is designed for straightforward installation using standard automotive tools. Its direct-fit design means no cutting, welding, or modifications are required, making it an ideal replacement for the factory catalytic converter. All necessary hardware and gaskets are included to simplify the installation process and eliminate the challenges often associated with corroded or seized 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 Catalytic Converter (Part #21-539)
• Installation hardware (bolts, nuts, clamps)
• Gaskets for proper sealing
• Detailed installation instructions

Ideal For:

This catalytic converter is perfect for vehicle owners who need a reliable, EPA-compliant replacement part that restores factory emissions performance without compromising engine efficiency. It is especially suited for those who prefer a direct-fit solution that minimizes installation time and complexity. Whether you are repairing a damaged converter or maintaining your vehicle’s emissions system, Magnaflow’s 21-539 offers peace of mind with quality construction and precise fitment.

Emissions Note

This replacement catalytic converter is designed to meet or exceed Federal emissions requirements as 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.