Intake Muffler BMW F20 F21 F30 F31 LCI B38 Air Filter Box Housing Petrol 8647449

Intake Muffler BMW F20 F21 F30 F31 LCI B38 Air Filter Box Housing Petrol is an original intake system component, designed specifically for Petrol units from the B38 family. This used, factory-spec construction ensures proper airflow to the engine, stable mounting of the filter element, and reduction of intake noise, which translates into smoother engine operation.

Specifications and technical data

• SKU: 8647449-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8647449
• Substitutable numbers: 8647449, 13718647449, 8654055, 13718654055
• Fuel type: Petrol
• Category: Air Filter Housings

Purpose and function in the intake system

The presented Intake Muffler BMW F20 F21 F30 F31 LCI B38 Air Filter Box Housing Petrol is a component of the air supply system in selected BMW 1 and 3 Series LCI models with the B38 engine. It is responsible for:

• stable seating of the air filter element,
• guiding the airflow to the throttle and subsequent intake components,
• reducing resonance and intake noise thanks to the integrated intake muffler,
• protecting the filter from contaminants in the engine bay.

Due to its precise fit for the specific petrol engine, the correct flow characteristics are maintained, which promotes stable engine operation and proper interaction with the control electronics.

Construction and fitment for BMW

The housing belongs to the Air filter housings category and was designed as an OEM part for the BMW brand. This means precise fitment with factory mounting points in the engine bay and compatibility with stock intake ducts and mounts. The design includes:

• a chamber for the air filter element with an appropriate filtration surface,
• integrated ports and connections for further intake components,
• an intake muffler section that limits acoustic vibrations.

Such a solution allows for maintaining factory airflow parameters, which is essential for the stock engine control unit calibration.

Benefits of using an original air filter housing

Using an original air filter housing in a B38 petrol engine provides a number of practical benefits:

• Factory fitment – no modifications required, correct positioning relative to other components in the engine bay.
• Stable airflow – maintaining the stock geometry of the intake ducts promotes even cylinder supply.
• Intake noise reduction – the integrated intake muffler reduces unwanted suction sounds, improving acoustic comfort inside the vehicle.
• Hassle-free maintenance – easy access to the air filter element and predictable installation method.

Choosing a used OEM component is particularly beneficial for post-accident repairs or restoring the car to a factory-like condition without interfering with the intake system design.

Condition, installation, and service application

The offered housing is in used condition, which allows for economical repair while maintaining the manufacturer's original specifications. The component is intended for installation in BMW vehicles with a petrol engine that utilize the B38 unit and its corresponding intake system.

When replacing, it is recommended to:

• inspect the seals and intake ducts that interface with the housing,
• install a new air filter element,
• verify correct mounting at the factory points after assembly.

Expanding the BMW intake system

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 intake chambers, air ducts, or further sections of intake mufflers, check out the available parts in the BMW Air filter housings category.

If you are considering a wider range of service work after a collision and want to consciously choose used components instead of aftermarket replacements, the following article may be helpful: Post-accident repair – why used body parts often work better than replacements.