Karbonius E46 M3 CSL (S54) Carbon Airbox

SKU: E46AD02-CF-2

Regular price $2,349.00



Kit Includes:

  • Airbox
  • CNC Machined Aluminum Components
  • Stainless-Steel Hardware
  • Ventilation Valve Bracket
  • M POWER Sticker
  • Certificate of Authenticity
  • OPTIONAL ESS E46 M3 Alpha-N E-Flash ECU Tuning Software

The BMW E46 M3 CSL is one of the most famous and mythical cars in the world, and part of the success is due to its carbon airbox. The intake generates what is probably one of the best noises of any sports car. The Karbonius CSL Style Airbox weighs in at a scant 1.7kg. It is made with 100% prepreg carbon fiber and baked at 125º in an autoclave at their facility in Spain under ISO 9001 Management Quality System rules by qualified staff. It is recognized as probably the best CSL style carbon airbox on the market.

The Karbonius CSL style airbox is based on 3D scans of a genuine OE CSL airbox, but presents several differences from the original:

  1. Trumpets made in carbon fiber instead in plastic: Resulting in additional weight reduction.
  2. Diameter and shape of the trumpets have been modified: Our larger diameter 51.5mm (vs 50mm) trumpets with a modified shape contribute to better airflow inside the engine.
  3. Exclusive 6th trumpet design: The standard 6th trumpet gets less air, so the shape has been redesigned to increase airflow.
  4. Softened internal chamber shape with sanding and clearcoat: Works to minimize the air turbulence inside the airbox.

All aluminum components are CNC Machined and anodized, with aluminum threads and stainless-steel hardware. We put a lot of attention towards matching the direction of the weave on our airbox, so the piece presents a perfect match between both sides and also creates a hermetic seal with a neoprene foam gasket between front/rear part.

Depending on other modifications and tune, expected gains are up to 25hp plus improved throttle response and a fantastic induction roar.

Product Features:

  • Appreciable Gain in Power
  • Aerodynamic Design
  • Great Fitment Guaranteed, Simple Installation
  • Reinforced in all key points
  • Awesome Sound
  • 100% prepreg carbon fiber
  • Cured in Autoclave
  • Exclusive and Numbered Airbox; Authenticity Guaranteed
  • Aggressive Appearance
  • 2 Year Warranty

Application Guide:

  • E46 M3
  • E36/7 Z3M S54B32 (2001-02)
  • E85 / E86 Z4M

NOTE: In lieu of installing the CSL-Specific Shortened Oil Dipstick, we recommend keeping the stock unit and rotating it about 180 degrees so it clears the airbox.

NOTE: Requires IND Install Kit:

  • OE BMW M3 CSL IAT Sensor
  • Alpha N MAF-to-IAT Conversion Harness
  • OE BMW M3 CSL Air Shut-Off Valve
  • OE BMW M3 CSL Crankcase Vent Hose
  • OE SMG Reservoir and Bracket for SMG-Equipped M3s

Warning: It is customer’s responsibility to check local laws for ensure legality when using this product on public roads and highways.

Product Inquiry

Dealer Application