Audi S4 B9 3.0 TFSI CWGD Front Air Intake Guide Duct Tube Vent 8W2819904A

Audi S4 B9 3.0 TFSI CWGD Front Air Intake Guide Duct Tube Vent is an original air intake system component, designed specifically for the 3.0 TFSI petrol engine. Thanks to its factory geometry and precise fitment to the body, it ensures stable airflow guidance to the intake system, supporting efficient engine operation and maintaining factory flow parameters.

Specifications and technical data

• SKU: RHD-8W2819904A
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W2819904A
• Substitutable numbers: 8W2819904A, 8W2 819 904 A
• Location on the vehicle: Front
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the intake system

The front air intake duct in the Audi S4 B9 3.0 TFSI is responsible for directing air from the front of the body to the subsequent components of the intake system. A correctly selected and installed duct:

• stabilizes airflow at higher speeds,
• reduces turbulence in the intake zone,
• supports the maintenance of consistent operating conditions for the petrol engine,
• helps maintain factory throttle response characteristics.

This component is particularly important in high-performance vehicles, where the intake system operates under a wide range of loads and requires stable air supply from the front of the vehicle.

Construction and fitment for Audi S4 B9

The duct belongs to the Lines, hoses and tubes group, meaning it was designed as part of a system for transporting media – in this case, air – within the engine bay. The duct's construction is adapted to:

• the geometry of the front body section of the Audi S4 B9 generation,
• the layout of components in the 3.0 TFSI petrol engine bay,
• factory mounts, enabling secure and repeatable seating.

As a result, installation is performed using original mounting points, without the need for modifications to the bodywork or other sub-assemblies, and the entire intake system maintains its structural integrity.

Performance characteristics and application

As a component intended for a petrol engine, the intake duct is adapted to operating conditions typical for TFSI units – variable temperatures, pressure differences, and dynamic load changes. In practice, this means that it:

• maintains a stable flow cross-section throughout the entire engine operating range,
• reduces the risk of local air turbulence before reaching subsequent intake components,
• supports uniform air supply to the power unit during city and highway driving.

This solution is particularly beneficial for dynamic vehicle operation, where the intake system must react quickly and consistently to changes in air demand.

Condition, verification and part selection

The offered item comes from a group of used parts, which allows for an economical replacement while maintaining original manufacturer specifications. Before selecting the duct for a specific Audi S4 B9 unit, it is worth verifying compatibility with the vehicle's configuration, in particular with the 3.0 TFSI petrol engine version and the front assembly layout.

To facilitate identification, the duct has an assigned OEM part number and interchangeable numbers, which allows for precise matching to the specific factory configuration without the need to use aftermarket replacements of uncertain origin.

Expanding the Audi intake system

If you are planning a comprehensive repair or upgrade of the intake system area in your Audi and need other components from the same group, such as additional air ducts, hoses, or tubes for transporting media in the engine bay, check the available parts in the Audi lines, hoses and tubes category.

If you are also interested in a comparison of popular diesel units in terms of performance, durability, and availability of aftermarket parts, it is worth reading the analysis in the article BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels, which helps to better understand the specifics of modern engines and their service requirements.