Audi A4 B8 A5 8T 2.0 TDI Air Intake Housing Air Filter Box Silencer 8K0133837BF

Visual condition of the part

The product shows signs of use visible in the photos. Audi A4 B8 A5 8T 2.0 TDI Air Intake Housing Air Filter Box Silencer is a factory-original air intake system housing designed for 2.0 TDI diesel engines in Audi A4 B8 and Audi A5 8T models. This component from the Air Filter Housings category is responsible for stable air delivery to the engine and the reduction of intake noise, which results in smoother and more comfortable engine operation. The offered component is an OEM solution, ensuring a perfect fit for the factory Audi diesel-powered intake system.

Specifications and technical data

• SKU: 8K0133837BF-2
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0133837BF
• Substitutable numbers: 8K0133837BF, 8K0 133 837 BF, 8K0133835AB, 8K0133837AB
• Fuel type: Diesel
• Category: Air Filter Housings

Purpose and function in the intake system

The air filter housing with an integrated intake silencer has been designed specifically for Diesel 2.0 TDI units in Audi A4 B8 and A5 8T platforms. Its tasks include:

• guiding air to the filter in a stable and consistent manner,
• ensuring the correct volume of the intake chamber,
• damping vibrations and airflow noise,
• maintaining a seal between the filter and the rest of the intake system. As a result, the engine receives air with the correct flow and stable pressure, which promotes smooth operation and proper interaction with the engine control system.

Benefits of using the original air filter housing

Using the factory air filter housing with a silencer in the Audi A4 B8 and A5 8T provides a range of practical operational benefits:

• Proper intake acoustics – the integrated silencer reduces intake noise, which improves driving comfort inside the cabin.
• Stable diesel engine operation – a properly shaped intake chamber supports correct cylinder filling in TDI units.
• Factory fitment for mounts and hoses – the housing works with stock brackets, air ducts, and other accessories.
• Optimal compatibility with the stock air filter – the filtration surface area and airflow direction specified by the manufacturer are maintained.

Installation and operational characteristics

The air filter housing with a silencer is structurally prepared for installation in the engine bay of Audi diesel vehicles without the need to modify factory mounting points. This facilitates:

• efficient replacement of a worn or damaged housing during service,
• maintaining the stock routing of intake hoses,
• preserving the factory geometry of the intake system, which is essential for the operation of the mass airflow sensor and engine control unit. This element is particularly useful for repairs following mechanical damage in the engine bay or when restoring a vehicle to its original factory configuration.

Application in diesel engine vehicles

The intake system in diesel units operates under different loads than in gasoline engines, which is why the air filter housing with a silencer has been adapted to the specific requirements of TDI engines. The design supports:

• proper airflow at high torque,
• reduction of vibrations transmitted from the engine to intake components,
• stable operating conditions for equipment controlling fuel dosage and turbocharging. Selecting the correct housing for a diesel engine is important both for component durability and for maintaining performance parameters consistent with the manufacturer's specifications. If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other parts from the same group, such as additional intake chambers, air supply hoses, or covers that work with the filter, check the available parts in the Audi Air Filter Housings category. To better understand the importance of using factory components in modern designs, it is worth reading an article comparing classic and contemporary automotive solutions: Classic Mini vs modern MINI – how the design has changed and which original Mini parts help preserve their character.