MagnaFlow CARB-Grade direct-fit catalytic converter (452789) for the 2004-2005 BMW 545i 645Ci and 745i 4.4L (driver/left side). A 409 stainless steel spun body 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. Interchanges with OE parts 18 40 7 522 555 and 18 40 7 522 571. Designed to meet CARB requirements for legal use in California and CARB states.
| Type | Direct-fit catalytic converter |
| Grade | CARB-Grade |
| Material | 409 stainless steel (spun body) |
| Hardware | Gaskets and hardware included |
| OEM Replacement | 18 40 7 522 555, 18 40 7 522 571 |
| Position | Left (driver side) |
| Emissions | CARB EO compliant (CA legal) |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2005 | BMW | 545i | Base |
| 2004-2005 | BMW | 645Ci | Base |
| 2004-2005 | BMW | 745i | Base |
| 2004-2005 | BMW | 745Li | Base |
