Front Catalytic Converter - 2011 528i E60

The 2011 BMW F10 528i represents a unique single-year transition model, retaining the N52B30 naturally aspirated inline-6 (240hp) before the 2012 switch to the N20 turbocharged four-cylinder. The front catalytic converters are integrated directly into the exhaust manifold assemblies, bearing BMW part numbers 18407572628 (cylinders 1-3) and 18407572629 (cylinders 4-6). These manifold-cat units are chassis-specific to the F10/F11 platform and do not interchange with E60 5-Series or E90 3-Series models despite similar engine architecture. When harvesting from salvage yards, verify the engine cover displays 'N52' and check the production date on the door jamb—only 2011 model year vehicles apply. Inspect casting numbers 7517677 and 7517678 on the heat shields to confirm left/right orientation. Common failures include cracked stainless steel manifold flanges and collapsed catalyst substrate triggering P0420/P0430 codes. Always remove pre-cat oxygen sensors before extraction, and plan to replace the aluminum exhaust fasteners as they are prone to snapping during removal.