Audi RS4 B8 4.2 FSI CFSA Air Filter Housing Box Assembly 8T0133106

Audi RS4 B8 4.2 FSI CFSA Air Filter Housing Box Assembly is a factory intake system component, designed specifically for the V8 FSI unit. It is responsible for stable airflow delivery to the engine, proper seating of the filter element, and reduction of intake noise. Thanks to its OEM design, it ensures precise fitment in the engine bay and compatibility with stock mounting points.

Specifications and technical data

• SKU: 8T0133836B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8T0133836B
• Substitutable numbers: 8T0133836B, 8T0 133 836 B, T8T0133106
• Category: Air Filter Housings

Purpose and function in the intake system

The presented air filter housing is an intake system component intended for the sports version of the Audi RS4 B8 generation with the 4.2 FSI CFSA engine. Its task is to provide airtight air routing from the front grille intake to the filter element, and subsequently to the throttle body, while maintaining the correct flow characteristics.

The OEM solution guarantees that the geometry of the filter chamber, ports, and mounts is consistent with the manufacturer's original specifications, which is important for both performance and engine stability. A properly designed housing helps maintain correct mixture parameters and reduces the risk of air turbulence before the mass air flow sensor.

Construction and fitment for Audi RS4 B8 4.2 FSI CFSA

The air filter housing has been constructed to withstand the high thermal and dynamic loads typical of a high-revving V8 engine. The body is profiled to ensure:

• stable mounting at factory points in the engine bay,
• proper sealing of the air filter element,
• compatibility with stock intake hoses and accessories,
• adequate workspace for maintenance.

As a result, installation is straightforward, without the need to modify other intake system components. OEM air filter housings are designed to maintain factory levels of noise, vibration, and acoustic comfort inside the vehicle.

Characteristics of the used component

The offered housing comes from disassembly and is classified as a used part. This means it may show signs of wear typical of components operating in the engine bay, while maintaining its structural functionality. For many users, this is a reasonable compromise between cost and maintaining the original manufacturer's specifications.

Choosing an original, used component allows you to maintain the consistency of the intake system with the factory Audi design, which is especially important in high-performance cars where the stability of engine operating parameters has a direct impact on the durability of the powertrain.

Benefits of using an original air filter housing

Using a factory air filter housing in the Audi RS4 B8 4.2 FSI CFSA provides a number of practical benefits:

• Factory fitment – compatibility with stock mounts, hoses, and engine accessories.
• Stable airflow parameters – maintaining the characteristics intended by the manufacturer.
• Intake system consistency – no need for adaptation or modification of other elements.
• Rational maintenance cost – the ability to replace a damaged housing without investing in expensive aftermarket alternatives.

For users who want to keep their car in a configuration close to factory, choosing an original housing is a technically safe and predictable solution in terms of operation.

Audi air filter housings – expansion and modernization

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as intake ducts, air supply hoses, or additional filter chamber components, check out the available parts in the Audi air filter housings category.

For drivers considering a broader service strategy using original parts from disassembly, a good starting point may be an article discussing the advantages of using premium used components – you can find it here: Used parts for Mercedes – original parts from disassembly.