BMW E87 E46 E90 E91 118d 318d M47N2 Intake Inlet Manifold

BMW E87 E46 E90 E91 118d 318d M47N2 Intake Inlet Manifold is a factory-original intake system component designed for BMW diesel engines, ensuring proper air supply to the unit. Thanks to its design compliant with the manufacturer's specifications, it guarantees stable engine operation, correct torque characteristics, and predictable vehicle behavior in daily use. This is a solution for users who are looking for original intake geometry and want to maintain the factory performance parameters of the power unit.

Specifications and technical data

• SKU: 7800578-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7800578
• Substitutable numbers: 11617800578, 800578, 11617788194, 7788194, 7800578
• Fuel type: Diesel
• Category: Intake Manifolds

Purpose and compatibility with the M47N2 engine

The presented manifold has been designed to work with the M47N2 power unit in BMW 1 Series and 3 Series models with 118d and 318d designations. As an element from the Intake Manifolds group, it is responsible for the even distribution of air to individual cylinders, which is crucial for engine smoothness, dynamics, and fuel consumption.

The manifold design is optimized for operation in a diesel engine, where stable cylinder filling conditions across a wide load range are essential. Using the correct manifold for a given type of power unit reduces the risk of ECU errors, rough idling, and performance drops.

Technical characteristics and role in the intake system

The intake manifold in this BMW model acts as a distribution channel for the air supplied by the turbocharger to each cylinder. Properly shaped intake runners influence:

• stable cylinder filling across the entire RPM range,
• proper cooperation with the diesel engine's fuel injection system,
• maintenance of correct air pressure and flow within the manifold,
• reduction of power losses resulting from leaks or incorrect intake shape.

A properly selected intake manifold is particularly important in diesel engines, where precise air and fuel metering has a direct impact on exhaust emissions, fuel consumption, and the durability of the power unit. Using a component that complies with factory specifications allows for maintaining stable intake system performance parameters without the need for additional modifications.

Benefits of using an original BMW intake manifold

Choosing an original intake manifold for the BMW E87, E46, E90, and E91 with the M47N2 engine is a solution that facilitates maintenance and reduces the risk of installation issues. Being from the same design group as the factory equipment, it ensures:

• fitment to factory mounting points and engine accessories,
• proper cooperation with the diesel engine control system,
• retention of stock torque and power characteristics,
• the possibility of direct replacement of a damaged or worn manifold without interfering with the unit's construction.

As a used part, the manifold is a cost-effective solution for users who want to restore the efficiency of the intake system while maintaining original BMW specifications and avoiding compromises typical of aftermarket replacements of uncertain origin.

Application in service and tuning practice

The intake manifold in the M47N2 engine is often replaced during repairs related to the intake system, airflow issues, or during major service work in the engine bay. Replacing it with a functional component allows you to:

• reduce the risk of leaks in the intake system,
• stabilize engine operation at idle and under load,
• limit power drops resulting from incorrect airflow,
• prepare the unit for further modifications, e.g., ECU software optimization.

For users interested in a broader perspective on exhaust and intake system components, including used manifolds in premium cars, a valuable supplement to your knowledge will be our blog article: Performance exhaust systems: used manifolds and sports catalytic converters on the road.

Condition, origin, and product group

The offered manifold belongs to the Intake Manifolds group dedicated to the BMW brand, which makes it easier to select parts based on the specific engine type and body generation. The item comes from the secondary market, which allows you to combine access to an original design with a reasonable cost of repair or modernization of the intake system.

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 manifolds, intake components, or parts cooperating with the air supply system, check out the available parts in the BMW Intake Manifolds category.

Additionally, to better understand current trends related to the use of OEM components in premium cars, it is worth reading the following material: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026.