Carbon Fiber Air Box Intake for Audi A4 B5 A6 C5 S40

True Cold Air Density for Audi B5/C5 and Volvo Modular Engines

Who It’s For: Designed specifically for Audi A4 B5, A6 C5, and Volvo S40 owners running the VAG 1.8 20V, 2.5 TDI V6, and Volvo Modular engine families. This is for the driver who understands that cooler intake charges equal consistent power.

The Problem: The factory plastic airboxes in the B5 and C5 chassis are massive heat-soak magnets. In cramped engine bays, especially with the 2.5 TDI V6 or the 2.2 Turbo, radiant heat from the block and manifold warms the intake tract. This leads to higher Intake Air Temperatures (IATs), causing the ECU to pull timing and reduce torque to prevent knock.

The Solution: The BMC CDA (Carbon Dynamic Airbox) corrects these factory design flaws by utilizing a genuine carbon fiber housing. Unlike plastic or aluminum, carbon fiber acts as a thermal insulator, keeping the aspirated air cool as it passes through the washable element. We’ve seen these systems significantly improve throttle response by using a dynamic over-boosting effect, where the internal flow deflector accelerates air directly into the manifold with minimal turbulence.

Why This is the Ultimate Upgrade

• Advanced Thermal Barrier: Genuine carbon fiber construction provides exceptionally low thermal conductivity, effectively shielding the intake charge from engine bay heat soak.
• True Dynamic Induction: The included flexible aluminum ducting allows for a front-mount pickup, creating a pressurized air-feed effect at higher road speeds.
• High-Velocity Internal Flow: Features an integrated air flow deflector that minimizes pressure drop and ensures the engine receives a consistent, high-volume air supply.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 1995-2000 Audi A4 (8D, B5) 1.8 / QUATTRO (125 HP)
• 1997-2000 Audi A4 (8D, B5) 2.5 TDI V6 / QUATTRO (150 HP)
• 2001-2005 Audi A6 (4B/C5) 2.5 TDI V6 (155 HP)
• 2002-2005 Audi A6 (4B/C5) 2.5 TDI V6 (163 HP)
• 1997-2005 Audi A6 (4B/C5) 2.5 TDI V6 / QUATTRO (150 HP)
• 2000-2005 Audi A6 (4B/C5) 2.5 TDI V6 / QUATTRO (180 HP)
• 1993-1995 Audi S2 2.2 TURBO (230 HP)
• 1996-2004 Volvo S 40 I 2.0 16V T (165 HP)
• 1996-2004 Volvo S 40 I 2.0 16V T (200 HP)

Interchange Part Numbers:

bmcACCDASP-01

The Performance Promise

Buy with confidence. As specialists in European forced induction and TDI performance, we know how critical air density is for these specific VAG and Volvo platforms. Backed by real automotive experts and fast shipping.