This is the front, close-coupled converter for BMW's N26 SULEV 2.0L four cylinder, replacing OE part 18 30 7 607 665, which BMW itself catalogues as the catalytic converter close to the engine. It is not the underbody unit; that secondary converter is a separate MagnaFlow part number, 52435. Fitment is N26 specific, so the far more common N20 engine is not covered even in the same model years. The spun stainless body sits over a ceramic substrate and measures 18.75 inches overall with pipe connections at both the inlet and outlet rather than flanges, and it carries two oxygen sensor ports, one pre-converter and one midbed. Two bolts are supplied. This is a Federal EPA part and is not legal for sale or installation in California, Colorado or New York.
Specifications
| Type | Direct-fit catalytic converter (MagnaFlow OEM Grade) |
| Position | Front, close-coupled primary converter; the underbody secondary unit is part 52435 |
| Engine | BMW N26B20A SULEV 2.0L; does not fit N20 |
| Emissions Standard | Federal / EPA compliant; not CARB certified |
| Legal For Sale | Not legal for sale or installation in California, Colorado or New York |
| Inlet | Pipe connection |
| Outlet | Pipe connection |
| Overall Length | 18.75 in |
| Body | Spun stainless steel, ceramic substrate |
| Material | 16 gauge 409 stainless tubing, 308 stainless MIG welds |
| Oxygen Sensor Ports | 2 (pre-converter and midbed) |
| Heat Shield | Not attached |
| Included Hardware | 2 bolts |
| OEM Replacement | BMW 18 30 7 607 665 |
| Warranty | Limited 5 year / 50,000 mile construction and 25,000 mile emission (Federal EPA converter terms) |
| Quantity | 1 (sold individually) |
| Part Number | 52257 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2014-2016 | BMW | 228i | Base |
| 2015-2016 | BMW | 228i xDrive | Base |
| 2012-2016 | BMW | 328i | Base |
| 2015-2016 | BMW | 328i GT xDrive | Base |
| 2013-2016 | BMW | 328i xDrive | Base |
| 2014-2016 | BMW | 428i | Base |
| 2015-2016 | BMW | 428i Gran Coupe | Base |
| 2014-2016 | BMW | 428i xDrive | Base |
| 2015-2016 | BMW | 428i xDrive Gran Coupe | Base |
Shipping
- Orders placed before 3 PM ET typically ship the same business day. Larger items ship within 1 to 3 business days.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Special order items follow a lead time we confirm with you individually before the order is committed.
- Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
- Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
- 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 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
- Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
- Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
- Product images may be representative. The SKU and specifications in the listing are what ships.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Returns & Refunds · Warranty
