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

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

$282.00
$282.00
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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

Fitment 1993-2005 Audi and Volvo Platforms
Engine Family VAG 1.8 20V / 2.5 TDI V6 / Volvo Modular 4-Cyl
Factory Ratings 125 HP - 230 HP (Engine Dependent)
Part Numbers bmcACCDASP-01

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.

Fitment

Make

Audi

Engine Size

 -

Year

 -

Installation & Tools

The Wrench Time

  • Estimated Time: 45-60 Minutes
  • Difficulty: 3/10 - Straightforward bolt-on installation, but requires delicate care with aged, heat-cycled plastics on the Audi A4 A6 platform.

Tools You Will Need

  • 10mm socket and ratchet (Battery terminal and bracket fasteners)
  • Flathead screwdriver or 7mm nut driver (Hose clamps and coupler bands)
  • T20 / T25 Torx driver (MAF sensor housing transfer screws)
  • Needle-nose pliers (OEM spring clamps and EVAP line retainers)
  • Panel popper tool (Air snorkel push-pins)
  • Mass Air Flow (MAF) cleaner spray (Optional, recommended for sensor maintenance)
Mechanic’s Pro Tip (The "Gotcha"):
The factory airbox on the Audi A4 A6 chassis is surrounded by brittle, heat-baked plastic vacuum lines, the N80 EVAP purge valve, and fragile push-release harness tabs. Never yank the stock airbox upward without thoroughly checking the lower side clips. If equipped, unclip the Ignition Control Module (ICM) or secondary air injection (SAI) hose gently, as forcing these connections will snap expensive 20-year-old plastic barbs.

Phase 1: Removing the Factory Part

  1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent ECU fault codes or accidental short circuits during sensor handling.
  2. Remove the Front Air Snorkel: Use a panel popper or flathead screwdriver to release the factory intake duct screws/clips securing the fresh-air snorkel to the front core support of your Audi A4 A6.
  3. Disconnect the MAF Sensor Harness: Locate the Mass Air Flow (MAF) sensor plug. Carefully depress the retaining tab using your thumb or a gentle touch with a flathead screwdriver, then pull the connector straight back. Do not pull directly on the wiring harness.
  4. Detach EVAP and Vacuum Routing: Using needle-nose pliers, unclip the N80 EVAP valve and any attached vacuum check valves from the side of the factory airbox housing. If your engine is equipped with Secondary Air Injection, squeeze the quick-disconnect ring on the lower airbox hose to release it.
  5. Loosen the Intake Pipe Clamp: Using a flathead screwdriver or 7mm nut driver, loosen the worm-drive clamp securing the intake accordion hose/turbo inlet pipe (TIP) to the MAF housing outlet.
  6. Extract the Factory Airbox: Firmly pull the OEM airbox vertically out of its rubber lower chassis mounting grommets. Ensure no vacuum lines snag on the lower housing during extraction.

Phase 2: Installing the Carbon Fiber Air Box Intake

  1. Transfer the Factory MAF Sensor: Remove the OEM MAF sensor housing from the factory airbox using a T20 Torx driver. Inspect the rubber sealing O-ring for dry rot. Transfer the MAF housing into the new carbon fiber air box assembly, ensuring the directional airflow arrow points toward the turbo/throttle body. Tighten fasteners securely by hand using a T20 Torx driver without over-torquing against the carbon weave.
  2. Seat the Carbon Air Box Housing: Lower the carbon fiber intake assembly into the engine bay of your Audi A4 A6, aligning the mounting pins with the factory rubber chassis grommets. Push down until seated firmly.
  3. Connect the Intake Piping: Slide the flexible intake inlet hose over the carbon air box outlet flange. Tighten the hose clamp using a flathead screwdriver or 7mm nut driver until snug. Do not crush the carbon fiber neck with excessive clamping force.
  4. Reconnect Sensor and Vacuum Lines: Plug the MAF electrical harness into the sensor housing until it clicks securely. Reattach the N80 EVAP purge line and secondary air injection line (if equipped) to their designated ports or brackets.
  5. Reconnect Battery and Perform ECU Calibration: Reconnect the negative battery terminal using a 10mm wrench. Turn the ignition key to the ON position (do not crank) for 30 seconds to allow the Audi throttle body to perform its auto-alignment. Start the engine and do not touch the gas pedal for at least 20 seconds; allow the engine to idle freely so the ECU can adapt fuel trim tables to the increased volumetric efficiency.

Disclaimer: This is a general guide provided for the Audi A4 A6. Always refer to your factory service manual for exact torque specifications and safety procedures.

Warranty

All products are backed by our Limited Lifetime Warranty. We stand by our quality. [See terms]
Carbon Fiber Air Box Intake for Audi A4 B5 A6 C5 S40

$282.00