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.
| 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 |
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