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The MagnaFlow 21-251 is a direct-fit catalytic converter for OBDII vehicles, built to replace the factory unit without cutting or welding. It uses mandrel-bent stainless steel tubing and a single laser-fusion weld for a leak-resistant, low-mass body that heats up quickly. It is EPA federal compliant, not California CARB legal, so it fits federally registered vehicles only. It interchanges with OE parts 6811 0125AB through AE, which points to a specific late-model application rather than a universal fit.
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Lowest price we've seen: $775.00 on Nov 13 at BB Wheels. Tracked across 12 stores since Nov 13.
The MagnaFlow 21-251 is a direct-fit replacement catalytic converter built to OEM grade. It is designed to meet or exceed Federal emissions requirements set by the EPA. It complies with legal standards for OBDII Federally registered vehicles with California or Federal/EPA emission systems.
The converter is made of highly corrosion resistant stainless steel with free-flowing mandrel-bent tubing. It replicates the OE design and uses a single laser fusion weld, which greatly reduces the possibility of a leak. The compact, low-mass design allows for greater thermal efficiency. MagnaFlow used 3D scanning systems during development so the part fits and functions like the original equipment.
It installs without cutting or welding, using the proper tools. It interchanges with OE parts 6811 0125AB, 6811 0125AC, 6811 0125AD and 6811 0125AE.
