BMW F30 F31 F32 LCI N57N N57Z Diesel Air Filter Box Intake Silencer 8573869

Visual condition of the part

The product shows signs of use visible in the photos.

BMW F30 F31 F32 LCI N57N N57Z Diesel Air Filter Box Intake Silencer is an original intake system component that serves as an air intake silencer and a stable housing for the filter element. Designed by BMW for precise airflow delivery to the diesel engine, it ensures optimal engine operating conditions and reduces intake noise.

Specifications and technical data

• SKU: 8573869-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8573869
• Substitutable numbers: 13718573869, 8573869
• Fuel type: Diesel
• Category: Air Filter Housings

Purpose and function in the intake system

The presented air filter box with an intake silencer is dedicated to BMW 3 Series F30/F31 and 4 Series F32 LCI (facelift) models equipped with N57N and N57Z diesel engines. This component is responsible for the airtight routing of air from the inlet to the filter element and subsequently to the intake manifold, which is crucial for the stable operation of the Diesel power unit.

The integrated intake silencer limits resonances and vibrations in the intake duct, improving acoustic comfort inside the cabin and reducing unwanted noise under higher engine loads. Thanks to the factory-engineered channel geometry, airflow remains predictable, which promotes correct fuel metering and proper operation of the turbocharging system.

Construction and advantages of the original air filter box

The original BMW air filter box is designed as a rigid, sealed chamber that provides adequate protection for the filter element against contaminants from the engine bay. Precisely shaped connection ports allow for a secure connection with intake hoses and other components of the intake system.

The main advantages of this solution include:

• factory fitment for the engine bay in F30, F31, and F32 LCI models with N57N/N57Z units,
• integrated intake silencer function, reducing intake noise,
• stable mounting of the air filter element, promoting uniform airflow,
• construction prepared for operation in the demanding thermal conditions of a diesel engine.

Benefits of using an original BMW part

Using an original air filter box in a BMW diesel intake system allows for maintaining the parameters specified by the vehicle manufacturer. Factory intake channel geometry supports the proper operation of the mass airflow sensor, turbocharger, and exhaust gas recirculation system, which is significant for performance and fuel consumption.

Compared to aftermarket replacements, the original component ensures:

• secure fitment with factory brackets and accessories in the engine bay,
• appropriate housing rigidity, limiting unwanted vibrations,
• compatibility with stock intake hoses and mounts.

Condition and use in vehicle service

The air filter box with an intake silencer is a particularly important element when servicing the intake system in vehicles with N57N/N57Z units, especially when leaks, housing cracks, or increased intake noise occur. Replacing it with an original component allows for restoring proper intake airtightness and stable engine operating conditions.

Thanks to the factory design, installation is predictable for an experienced mechanic, without the need to modify brackets or hoses. This solution is particularly beneficial for comprehensive diesel engine maintenance, where the consistency of all intake system components is important.

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other components from the same group, such as additional housings, intake ducts, or air supply hoses, check out the available parts in the BMW Air Filter Boxes category.

To better plan service work and make informed decisions regarding the selection of used components, it is worth reading the guide on suspensions and used parts, available in the article "Stock vs. sports suspension – design differences and is it worth buying used suspension parts?".