Racingline High-Flow Air Filter – Audi S4/S5 3.0T (B9)

Racingline High-Flow Air Filter – Audi S4/S5 3.0T (B9) – VWR1141S4

The Racingline High-Flow Air Filter is one of the simplest and most cost-effective upgrades available for the Audi S4 and S5 3.0T (B9). It drops straight into your standard airbox, replacing the restrictive paper element with a high-flow design that lets your supercharged 3.0 TFSI engine breathe more freely.

The factory paper filter is built primarily with service life and noise reduction in mind, which means airflow takes a back seat. By swapping it for the Racingline filter, you remove a known bottleneck in the intake system and allow more clean, cool air to reach the engine. The result is a modest but genuine improvement in throttle response, performance and fuel efficiency, with no complicated installation required.

What it does for your car

• Direct fit: Designed as a drop-in replacement for the standard B9 S4/S5 airbox, no modifications needed.
• Improved airflow: Flows considerably more air than the OEM paper filter, helping the engine operate more efficiently.
• Subtle performance gains: A small but worthwhile lift in power and torque, plus the potential for better fuel economy when driven steadily.
• Long service life: Engineered for durability and consistent filtration over high mileages.
• Retains factory looks: Keeps the original airbox in place, so engine bay appearance is unchanged.

Why upgrade the air filter?

The 3.0 TFSI engine in the B9 S4 and S5 produces strong power out of the box, but it relies on a steady supply of cool, dense air to do its best work. A free-flowing filter helps maintain that supply, especially when the engine is under load or during longer high-rpm driving. It also pairs well with future upgrades such as an ECU remap or full intake system, where reduced restriction becomes even more beneficial.

It is worth setting realistic expectations: on its own, a high-flow filter will not transform the car, but it removes a sensible restriction and lays the groundwork for further tuning. For the cost, it is one of the easiest worthwhile changes you can make.

Fitment

This filter is developed specifically for the Audi S4 and S5 (B9) fitted with the 3.0 TFSI supercharged engine. To confirm compatibility with your exact model and year, please use the vehicle lookup on the Racingline Shop or check the Vehicle Fitment tab on this listing for the full application list.

As an authorised UK dealer for Racingline Performance, we supply only genuine Racingline products, developed and tested in motorsport before being refined for everyday road use.

Applications

Please note, customers are wholly responsible for checking fitment for their vehicle.