A spun body direct-fit converter for the rear passenger side underbody position, the downstream unit on a car that runs four converters in total. It bolts in at a flange inlet with a pipe connection at the outlet, so no cutting or welding is needed. Tubing is 16 gauge 409 stainless steel joined with 308 stainless MIG welds, with a single laser fusion weld replicating the OE spun body to cut down leak paths, and the mandrel bent tubing holds OEM geometry through the bend. The assembly runs 43.125 in overall on a ceramic substrate and interchanges with OE parts 18 30 7 547 840 and 18 30 7 566 937. It is certified under CARB Executive Order D-193-175 and legal for sale in all 50 states, provided the vehicle's engine family number appears in that order.
Specifications
| Type | Direct-fit catalytic converter, California Grade CARB compliant, spun body |
| Position | Rear, passenger side (right) — secondary / downstream converter |
| Substrate | Ceramic |
| Inlet Type | Flange |
| Outlet Type | Pipe connection |
| Overall Length | 43.125 in |
| Material | 16 gauge 409 stainless steel mandrel bent tubing, 410 stainless steel barbed hangers |
| Welds | 308 stainless steel MIG, plus a single laser fusion body weld |
| Oxygen Sensor Ports | 0 |
| Air Tube | None |
| CARB Executive Order | D-193-175 |
| Emissions Certification | CARB certified and New York certified; legal for sale in all 50 states |
| Included Hardware | Gaskets, clamps, hangers and heat shield are not included |
| Heat Shield | Not attached |
| Part Number | 5571765 |
| OEM Replacement | 18 30 7 547 840 and 18 30 7 566 937 |
| Pairs With | MagnaFlow 5571764, the rear driver side converter for the same applications |
| Quantity | 1 |
| Warranty | Limited 5 year / 50,000 mile construction and 5 year / 50,000 mile emissions |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2006 | BMW | 325i | Base |
| 2006 | BMW | 325xi | Base |
| 2007-2013 | BMW | 328i | Base |
| 2009-2013 | BMW | 328i xDrive | Base |
| 2007-2008 | BMW | 328xi | Base |
| 2006 | BMW | 330i | Base |
| 2006 | BMW | 330xi | Base |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
