BMW F20 F21 F30 LCI B37 B47 Air Filter Box Intake Silencer Cover 8578649

Visual condition of the part

The product shows signs of use visible in the photos.

BMW F20 F21 F30 LCI B37 B47 Air Intake Filter Housing is an original housing from the Air Filter Housings category, designed for the intake system in selected post-facelift BMW 1 and 3 Series models. The component ensures proper air guidance to the filter and stable mounting of the filter element, which promotes smooth engine operation.

Specifications and technical data

• SKU: 8578649-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8578649
• Substitutable numbers: 8578649, 13718578649
• Weight: 150
• Part type: Air Filter Housing
• Category: Air Filter Housings

Purpose and Function in the Intake System

The BMW Air Intake Filter Housing is responsible for the airtight seating of the filter element and directing the flow of air drawn into the engine. A correctly selected housing:

• stabilizes airflow in the intake duct, reducing turbulence before the airflow meter and intake manifold,
• ensures proper sealing between the filter and the rest of the system, which reduces the risk of contaminants entering the engine,
• maintains the correct position of the filter relative to the intake ports and mounting points in the engine bay.

In BMW F20, F21, and F30 LCI vehicles with B37/B47 engines, a properly functioning air filter housing is crucial for stable engine operation, idle quality, and response to load.

Construction and Technical Features of the Housing

The presented housing belongs to the Air Filter Housings category, specifically designed for BMW intake systems. The construction includes:

• dedicated mounting points for the body and adjacent components, facilitating correct positioning in the engine bay,
• integrated ports and sockets for intake hoses and potential sensors, in line with solutions used in the F series,
• a filter chamber housing shaped to optimize airflow and fit within the spatial constraints of the specific model.

The appropriately designed geometry of the housing supports stable intake air parameters, which is important for the engine control system's operation.

Condition, Origin, and Benefits of Use

The component comes from the BMW range and is an OEM part, meaning it complies with factory dimensional and assembly standards. As a used part, it offers:

• factory fitment for the intake system in the appropriate versions of BMW F20, F21, and F30 LCI,
• compatibility with original mounting points and hose routing,
• direct replacement capability for a damaged or deformed housing without the need for installation modifications.

Using an original air intake filter housing allows for the restoration of correct intake system operating conditions after a collision, mechanical damage, or normal wear and tear of the housing.

Installation and Operational Aspects

The housing is designed for installation at factory mounting points on the vehicle body, simplifying service and subsequent air filter maintenance. In practice, this means:

• predictable installation time for mechanics or service centers,
• easy access to the filter element during periodic inspections,
• maintenance of original intake geometry, which helps preserve engine performance parameters as intended by the manufacturer.

Additionally, the appropriately selected mass of the component contributes to maintaining proper load distribution in the engine bay and does not require modifications to existing brackets.

Related BMW Air Filter Housings and Technical Knowledge

If you need other parts from the BMW Air Filter Housings category for your car, check out the BMW air filter housings available in our store to select a component that matches your specific engine and body version.

For drivers interested in a broader technical context of the chassis system and the impact of component condition on safety, we recommend the guide article Suspension System – A Comprehensive Guide to Shock Absorbers, Control Arms, and Stabilizers, which helps in better planning vehicle servicing.