MagnaFlow OEM-Grade Federal/EPA-compliant direct-fit catalytic converter (51664) for the 2000-2004 Audi A6 Quattro 4.2L and 2002-2003 Audi S6 4.2L (passenger/right side). Spun-body 409 stainless construction with mandrel-bent tubing and a single laser-fusion weld replicates the OE design for smooth flow and a leak-resistant seal; installs with no cutting or welding and includes gaskets and hardware. Federal/EPA compliant (not for sale in California). Meets OBDII Federal/EPA emission standards.
| Type | Direct-fit catalytic converter |
| Grade | OEM Grade |
| Material | 409 stainless steel (spun body) |
| Position | Right (passenger side) |
| OEM Replacement | 4B3 253 058 AX, 4B3 253 058 BX, 4B3 254 550 CX, 4B3 254 550 GX |
| Emissions | Federal/EPA compliant (not for sale in California) |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2000-2004 | Audi | A6 Quattro | Base |
| 2002-2003 | Audi | S6 | Avant |
