Mazda 6 Catalytic Converter - Passenger Side Rear - Magnaflow - OEM Grade Direct-Fit - `03-`05
Mazda 6 Catalytic Converter - Passenger Side Rear - Magnaflow - OEM Grade Direct-Fit - `03-`05
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Mazda 6 Catalytic Converter - Passenger Side Rear - Magnaflow - OEM Grade Direct-Fit - `03-`05. This direct-fit replacement is designed to restore proper emissions control and maintain factory exhaust flow for 2003–2005 Mazda 6 models.
MagnaFlow’s OEM-grade direct-fit converter (part 51739) replicates OE geometry using spun-body construction and precise 3D-scanned tooling to ensure fit and function similar to the original. The unit features mandrel-bent tubing for consistent flow, a single laser fusion weld to reduce leak points, and included gaskets and hardware to simplify installation without cutting or welding when proper tools are used. The compact, low-mass design improves thermal efficiency and helps keep the check engine light from being triggered due to catalytic efficiency faults.
Features
- Direct-fit for 2003–2005 Mazda 6 passenger side rear (interchanges with AJ59-20-550F and AJB4-20-550A)
- Mandrel-bent tubing for consistent exhaust flow
- High-strength 16-gauge 409 stainless steel tubing with 308 stainless welds
- Spun-body design with single laser fusion weld to minimize leaks
- Includes gaskets and hardware for installation
- Designed to meet Federal/EPA emissions requirements (not CARB certified)
Please note: this MagnaFlow direct-fit converter is built to meet Federal/EPA standards for OBDII federally registered vehicles but is not legal for sale or installation in California, Colorado, or New York. Verify local regulations before purchasing.
If you have questions or need help confirming fitment, call us directly at 512-982-9393 (TX) or 562-981-6800 (CA). We have two service locations—Austin, Texas and the Los Angeles, California area—where we offer installation and customization services. If you’re considering multiple items, contact us for possible shipping discounts. We install on premises at both locations.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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Call us at 512-982-9393 (Austin, TX) or
562-981-6800 (Signal Hill, CA)
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