MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 51221 helps keep the check engine light off. DIY installation is easy with the proper tools (no cutting or welding required). With features including mandrel-bent tubing to eliminate flow restrictions and stainless steel construction to resist corrosion, you can have confidence in the quality of this catalytic converter. Using state-of-the-art 3D scanning systems in the design process, the MagnaFlow metrology department ensures this new part to fit and function like the original equipment. This direct-fit catalytic converter is designed to fit the 2005-2007 Ford F-250 Super Duty, 2005-2007 Ford F-350 Super Duty, and additional vehicles. Avoid potential exhaust leaks by using the included gaskets to get a proper seal. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 2005 |
Ford |
F-250 Super Duty |
Harley-Davidson Edition |
| 2005-2007 |
Ford |
F-250 Super Duty |
King Ranch |
| 2005-2007 |
Ford |
F-250 Super Duty |
Lariat |
| 2005-2007 |
Ford |
F-250 Super Duty |
XL |
| 2005-2007 |
Ford |
F-250 Super Duty |
XLT |
| 2005 |
Ford |
F-350 Super Duty |
Harley-Davidson Edition |
| 2005-2007 |
Ford |
F-350 Super Duty |
King Ranch |
| 2005-2007 |
Ford |
F-350 Super Duty |
Lariat |
| 2005-2007 |
Ford |
F-350 Super Duty |
XL |
| 2005-2007 |
Ford |
F-350 Super Duty |
XLT |
| 2005-2007 |
Ford |
F-450 Super Duty |
Lariat |
| 2005-2007 |
Ford |
F-450 Super Duty |
XL |
| 2005-2007 |
Ford |
F-450 Super Duty |
XLT |
| 2005-2007 |
Ford |
F-550 Super Duty |
Lariat |
| 2005-2007 |
Ford |
F-550 Super Duty |
XL |
| 2005-2007 |
Ford |
F-550 Super Duty |
XLT |
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
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Price Match Guarantee:
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We are committed to providing the best value. If you find a lower advertised price from a verified vendor, we will match it. Shop with confidence knowing you’re getting the industry's lowest price.
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Project Incentives:
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We reward enthusiasts who trust us with their major projects. Use these tiered codes at checkout to apply instant savings to your order:
• AH25 — $25 OFF $500+ | • AH60 — $60 OFF $1000+
• AH180 — $180 OFF $3000+ | • AH400 — $400 OFF $6000+
• AH630 — $630 OFF $9000+
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Fitment Guarantee:
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Avoid the headache of the wrong part. If you are unsure about compatibility, contact us first. If we verify the fitment for your vehicle via email and it doesn’t fit, we will handle the exchange at no cost to you.
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Authorized Retailer:
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Every product we sell carries its full original manufacturer’s warranty. While warranties are serviced by the brands themselves, we act as your advocate—handling technical details to ensure your claim is processed fairly.
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Leveraging our massive supply chain, we secure hard-to-find components that other shops can't access. Whether it's a standard upgrade or a custom exotic application, we have the network to get it to your door.
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Secure Logistics:
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Contact Page.
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Direct Consultation:
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Monday – Friday | 9am – 5pm EST
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support@autohousesupply.com
Our experts will review your specifications and provide written confirmation for your build.
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Secure Shipping:
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We offer FREE Ground Shipping within the 48 contiguous United States. Most in-stock orders process within 48 hours. For your security, high-value performance parts require a signature upon delivery to ensure they reach you safely.
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Transit Protection:
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Please inspect your order immediately. Damage must be reported within 48 hours. For freight/LTL items, if you cannot inspect the contents immediately, please write "Subject to Inspection" on the delivery receipt before signing.
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Flexible Returns:
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Unused items in brand-new, original packaging can be returned within 30 days. While standard refunds incur a 25% restocking fee, we will waive this fee entirely if you choose store credit or an exchange for your next upgrade.
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Exclusions:
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To ensure every customer receives brand-new, untampered components, parts that have been installed, modified, or used are non-returnable. Custom builds, special orders, and wheel/tire packages are considered final sale.
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Need assistance? Reach out via our
Contact Form before shipping any items back so we can provide you with an RMA number.
Fitment Guarantee
Fitment guides and tools are helpful—but your car is unique! Some trims and options aren’t always listed, so if you want 100% confidence that a part will fit, our team is happy to double-check for you. We take the guesswork out of your purchase by standing behind our expertise.
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Verify Your Build:
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If this product doesn't list your specific vehicle data, simply reach out to support@autohousesupply.com. We will manually verify compatibility for you.
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Our Promise:
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When we confirm a fitment in writing and it doesn’t work for your application, we cover the return shipping and exchange it at no cost to you.
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Questions? Send us your
Year, Make, and Model via our
Contact Form and we’ll get you a definitive answer so you can buy with confidence.
