Intake Manifold BMW E90 LCI F10 F20 F21 F30 N47N Inlet Unit With Flap 7807991

Visual condition of the part 

The product shows signs of use visible in the photos. 

Intake Manifold BMW E90 LCI F10 F20 F21 F30 N47N Inlet Unit With Flap is an original component from the Intake manifolds group, designed for BMW N47N family diesel engines in popular 3, 5, and 1 series models. The swirl flap design ensures precise airflow shaping, which promotes efficient engine operation and stable combustion parameters.

Specifications and technical data

• SKU: 7807991-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7807991
• Substitutable numbers: 11617807991, 7807991
• Category: Intake Manifolds

Purpose and function of the BMW intake manifold

The intake manifold with flaps in N47N engines is responsible for the even distribution of air to individual cylinders and for changing the flow characteristics depending on load and engine speed. Thanks to the use of swirl flaps, it is possible to achieve better mixture turbulence, which translates into more efficient combustion, more stable idling, and improved throttle response in typical usage ranges.

A properly selected and functional intake manifold is important for the operation of the intake system, reducing smoke emissions, and maintaining correct engine operating parameters in both city and highway driving.

Construction and key technical features

The presented manifold belongs to the group of OEM BMW components, designed specifically for N47N engines used in the E90 LCI, F10, F20, and F30 generations. The use of flaps in the intake ducts allows for dynamic changes in flow geometry, which is particularly important in modern diesel units with advanced electronic control.

The most important design features include:

• integrated swirl flaps in the intake ducts,
• housing adapted to work with N47N engine accessories,
• arrangement of connectors and mounts consistent with the factory BMW intake system.

This configuration allows for seamless integration with factory equipment and the maintenance of parameters specified by the vehicle manufacturer.

Benefits of using an original BMW manifold

Using an original intake manifold with flaps in an N47N engine allows you to maintain the factory operating characteristics of the power unit. Compared to non-original solutions, the OEM component ensures:

• proper fitment to the cylinder head and other intake components,
• compatibility with engine control unit maps,
• stable airflow parameters across the full load range.

For the user, this means more predictable vehicle behavior, correct cooperation with engine electronics, and reduced risk of operational problems resulting from inaccurate fitment or different duct geometry.

Condition, verification, and practical application

The item comes from dismantling and is offered as used, which is an attractive cost-effective solution while maintaining the manufacturer's original specifications. This type of intake manifold is particularly useful for repairs related to swirl flap failure, intake leaks, or the need to replace a damaged housing.

Before installation, a standard workshop procedure is recommended, including checking for leaks, the condition of the flaps, and the cleanliness of the intake ducts, in order to fully utilize the potential of the intake system and ensure stable, repeatable engine operation in daily use.

Intake system expansion and technical knowledge

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 additional manifolds, intake elements, or components working with the air supply system, check out the available parts in the BMW Intake manifolds category.

To deepen your knowledge on the selection and operation of exhaust system elements and manifolds in premium brand cars, it is worth reading the blog article Performance exhaust system: used manifolds and sports catalytic converters on the road, which discusses the practical aspects of using used manifolds in BMW and other popular brands.

If you are considering choosing between a used original part and a replacement, the guide 5 reasons why a used OEM part is a better choice than a replacement may also be helpful, presenting specific technical and operational arguments.