The Karbonius E46 M3 CSL (S54) Carbon Airbox - Race is a track-focused evolution of the legendary CSL airbox, featuring an integrated snorkel that ducts cool air directly from the front of the car. The result is lower intake temperatures, improved airflow, and an even more dramatic induction note — all wrapped in a motorsport-grade carbon fiber package.

Manufactured from 100% prepreg carbon fiber and autoclave-cured in Spain under strict ISO 9001 quality standards, the Race Airbox is produced by highly qualified staff through a manual process with exhaustive quality control at every stage. The finish is high-gloss with UV protection for a stunning appearance that holds up in any environment.

Beyond measurable horsepower gains, the Race Airbox delivers sharper throttle response and that unmistakable S54 CSL induction roar — now with built-in cold-air ducting that eliminates the need for a separate snorkel.

What's Included

• Carbon fiber airbox with integrated snorkel
• CNC-machined aluminum components
• Stainless-steel hardware
• Ventilation valve bracket
• Numbered certificate of authenticity

Product Details

• Integrated snorkel for cold-air ducting from the front of the vehicle
• Appreciable gain in power with proper tuning
• Improved throttle response and induction sound
• Aerodynamic, reinforced design at all key points
• 100% prepreg carbon fiber construction
• Autoclave-cured for strength and finish quality
• High-gloss finish with UV protection
• Individually numbered for authenticity
• 2-Year manufacturer warranty

Vehicle Applications

• BMW E46 M3 (S54)
• BMW Z3 M Coupe & Roadster (2001–2002, S54)
• BMW Z4 M (E85 / E86, S54)

Installation Note

Instead of installing a shortened CSL-specific dipstick, IND recommends rotating the factory dipstick approximately 180 degrees to provide proper clearance with the airbox.

Required Installation Components (Sold Separately)

• IND E46 M3 CSL S54 Carbon Airbox Installation Kit
• OEM BMW M3 CSL IAT Sensor
• Alpha-N MAF-to-IAT Conversion Harness
• OEM BMW M3 CSL Air Shut-Off Valve
• OEM BMW M3 CSL Crankcase Vent Hose
• OEM BMW M3 CSL SMG Reservoir & Bracket (SMG models only)

Recommended Upgrades

• BMW E46 M3 CSL Replacement Air Filter
• Karbonius M3 CSL (S54) Carbon Airbox Heat Shield Kit

Notes

• Designed and manufactured in Spain by Karbonius Composites under ISO 9001 standards
• It is the customer's responsibility to check local laws to ensure legality when using this product on public roads and highways
• View emissions compliance notice