BMW X3 E83 E90 E91 E92 LCI 335d M57N2 Engine Intake Manifold 7790480

BMW X3 E83 E90 E91 E92 LCI 335d M57N2 Engine Intake Manifold is an original component from the Intake manifolds group, designed for BMW diesel engines. Engineered for the M57N2 unit in the 335d version, it ensures proper air distribution to the cylinders and stable operating conditions for the intake system. This used OEM component is a sensible choice for servicing advanced BMW diesel engines when structural fitment and predictable performance parameters are essential.

Specifications and technical data

• SKU: 7809671-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7809671
• Substitutable numbers: 7809671, 11617809671, 7790480, 11617790480
• Fuel type: Diesel
• Category: Intake Manifolds

Purpose and compatibility with Diesel engines

The manifold has been developed specifically for BMW units from the M57N2 family in the 335d version, used in models such as the X3 E83 and the 3 Series E90, E91, and E92 LCI. The design is adapted to the characteristics of a diesel engine, where precise control of air volume and flow direction across a wide load range is crucial.

Being dedicated to a specific family of diesel engines ensures the maintenance of correct intake port geometry, mounting points, and accessory connections, which facilitates installation and reduces the risk of fitment issues.

Function in the intake system

As a component of the intake system in a diesel engine, the manifold is responsible for:

• even air distribution to individual cylinders,
• maintaining stable conditions for combustion chamber filling,
• cooperation with engine management components (e.g., elements regulating air flow),
• maintaining the proper rigidity and tightness of the entire intake system.

A properly selected intake manifold helps maintain correct engine performance, reduce power loss, and prevent unstable idle speeds resulting from leaks or incorrect intake port shapes.

Benefits of using an original BMW manifold

Using an original manifold from this series offers a number of practical advantages:

• factory fitment to the cylinder head and M57N2 engine accessories,
• preservation of factory air flow parameters,
• consistency with factory engine control unit calibration,
• reduced risk of installation problems compared to aftermarket replacements with uncertain geometry.

The used OEM component allows for economical repair while maintaining the original operating characteristics of the power unit, which is particularly important in powerful, six-cylinder BMW diesel engines.

Condition, verification, and service application

The product comes from disassembly and is offered as a used part, which in workshop practice often represents an optimal compromise between cost and quality. Before installation, a standard service procedure is recommended: thorough cleaning of the intake ports, inspection of sealing surfaces, and verification of mounting points for any potential mechanical damage.

This type of intake manifold is particularly useful for:

• repairs following an intake system failure,
• eliminating leaks causing power loss or ECU errors,
• comprehensive maintenance of the M57N2 engine in the 335d version when restoring the factory intake configuration is required.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional manifolds, intake elements, or housings, check the available parts in the BMW Intake manifolds category.

Technical support and additional knowledge

When working with the intake and exhaust system in powerful diesel engines, it is worth looking at the entire air and exhaust flow path as a single system. For users interested in a broader context of modifications and service, including the selection of used manifolds, the blog article Performance exhaust system: used manifolds and sports catalytic converters on the road may be useful, as it discusses practical aspects of selecting and operating such components in premium brand vehicles.