BMW F20 F30 LCI M140i M240i 340i 440i B58 Turbocharger Part Housing 7643147

BMW F20 F30 LCI M140i M240i 340i 440i B58 Turbocharger Part Housing is an original component from the Turbochargers and parts group, designed for the B58 engine in facelifted BMW 1, 2, 3, and 4 Series sports models. This is a factory-made hot-side turbine housing, ensuring proper exhaust gas flow and stable operating conditions for the turbocharging system in the B58 engine.

Specifications and technical data

• SKU: 9423788-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9423788
• Substitutable numbers: 11659423788 7643147, 9423788
• Category: Turbos & Parts

Purpose and compatibility with the B58 engine

The presented turbine housing has been designed specifically for the B58 engine fitted in BMW F20, F30 LCI, M140i, M240i, 340i, and 440i models. The component's construction is optimized for exhaust gas flow, which allows for maintaining factory boost parameters and the engine's performance characteristics. By using an original solution, the correct positioning of the turbocharger relative to the exhaust manifold and the vehicle's exhaust system is maintained.

Construction and technical properties

The turbine housing plays a key role in the turbocharging system – it is responsible for directing the exhaust gas stream onto the turbine wheel, maintaining proper pressure, and ensuring the thermal stability of the entire assembly. The factory geometry of the exhaust channels and the precise machining of the mating surfaces promote joint tightness and reduce the risk of leaks in high-temperature areas. Using an original housing from the Turbochargers and parts group allows for compatibility with factory mounts, accessories, and heat shields. This is particularly important in the B58 engine, where the turbocharging system operates under demanding temperature and pressure conditions, and every element must work with other components according to the manufacturer's specifications.

Use in service and upgrades

This type of turbine housing is used both for standard replacement of worn parts and for turbocharging system repairs following mechanical or thermal damage. It is also suitable for projects where the priority is to maintain the factory specification of the B58 engine without interfering with the original turbocharger operating characteristics. Choosing an original BMW component reduces the risk of fitment issues, leaks, or incorrect turbocharger positioning. When selecting components for turbocharging systems in premium cars, it is worth using factory solutions that have been tested under operating conditions and comply with the manufacturer's requirements. This translates into stable engine operation, predictable performance, and a lower risk of secondary failures.

Condition, origin, and benefits of choosing OEM parts

The offered turbine housing is an original BMW aftermarket component, meaning it comes from factory production and was designed specifically for the B58 engine configuration. Unlike random replacements, the OEM part maintains the correct geometry, mounting points, and compatibility with other turbocharger and engine accessory components. When selecting original used components for a BMW, it is worth using the VIN to precisely confirm compatibility with a specific engine and body version – this is described in detail in the article How to select original used parts for BMW, Audi, and Mercedes using the VIN?. For older premium vehicles, choosing a factory part from the secondary market is often a reasonable alternative to new replacements – you can find more on this topic in the material why a used factory part is often the best solution for older cars.

Expanding the turbocharging system in a BMW

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as turbocharger housings, mounting elements, or hot-side turbocharging system components, check the available parts in the BMW Turbochargers and parts category.