Performance Air Filter for Audi A6 (2008-2010) with 5.0L TFSI RS6 Engine

Optimizing the V10 Biturbo: BMC High-Flow Intake Upgrade for the Audi C6 RS6 (BUH Engine)

Who It’s For: Engineered for the Audi RS6 owner running the legendary 5.0L TFSI V10 powerplant who demands better volumetric efficiency without compromising engine safety.

The Symptom: The factory induction system on the BUH-coded V10 is a marvel of engineering, but it is ultimately limited by standard paper filtration. These OEM filters are designed for service intervals and noise suppression rather than maximum flow. In a twin-turbocharged environment, restrictive paper elements create a pressure drop across the filter, forcing the turbos to work harder and generate more heat to meet target boost levels. This results in a slight hesitation in throttle snap and a loss of potential power at the top of the RPM range.

The Engineering Fix: This BMC replacement filter kit utilizes a multi-layered cotton gauze media, treated with low-viscosity oil to capture impurities as small as 7 microns—significantly tighter than the 10-micron industry standard for paper. By utilizing a "Full Moulding" production process, the filter features a continuous perimeter with no welded joints, ensuring a perfect seal within the C6 airbox. This creates a streamlined, laminar airflow path that reduces turbulence and allows the V10 to breathe more naturally under heavy load.

Why Mechanics Choose This Kit

• Enhanced Filtration Surface: Provides a 3-micron improvement over OEM standards, ensuring that even microscopic debris stays out of your turbo compressors.
• Laminar Flow Dynamics: The epoxy-coated alloy mesh and cotton design reduce air resistance, allowing for faster turbo spool-up and improved throttle response.
• Lifetime Durability: Unlike disposable paper filters, this unit is fully washable and regenerable, designed to outlast the vehicle itself when maintained correctly.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2008 Audi RS6 (4F/C6) 5.0 TFSI V10
• 2009 Audi RS6 (4F/C6) 5.0 TFSI V10
• 2010 Audi RS6 (4F/C6) 5.0 TFSI V10

Interchange Part Numbers:

FB723/20, 4F0129620, 4F0129620A

The Performance Promise

Buy with confidence. As tuners, we know that the C6 RS6 is a sensitive platform. This BMC filter is the exact same technology used by Formula 1 teams to ensure maximum airflow without risking internal engine wear. Backed by real automotive experts and fast shipping.