Eventuri has spent much time in ensuring our carbon airbox was produced by only the best motorsport development companies who are also responsible for producing F1 body panels. The aim was to produce the best aftermarket CSL style airbox ever released using up to date cutting edge manufacturing processes. Part of what makes the E46 M3 CSL special is the carbon airbox and its ability to produce what is probably one of the best noises of any sports car. An E46 M3 with a CSL airbox is probably the most ideal all-round sports car for most enthusiasts giving far more power, throttle response and that fantastic induction roar.

• Perfect Shape and Design
• Lightweight and strong construction
• 100% prepreg carbon fiber
• Perfect Fitment

Fitment: 2001-2005 E46 M3

Variant Option

Key Benefits

• Authentic CSL induction sound with full MAF compatibility
• No ECU conversion required and no tune required
• Smooth, OEM like throttle response and drivability
• CFD optimized internal geometry for efficient flow
• Patented Venturi filter housing for stable, laminar airflow
• Prepreg carbon construction for strength, heat stability, and resonance
• Cold air scoop saturates the intake mouth while preserving brake duct airflow

What Is Included

Full Hybrid Airbox + Intake (EVE-E46ABX-CF-INT)

• Carbon fiber main airbox
• Carbon fiber airbox snorkel with MAF tube and CNC MAF boss
• Six pre-installed thermoplastic molded trumpets with CNC stainless reinforcement rings
• Carbon fiber filter housing
• Bespoke dry high flow filter
• Carbon fiber cold air scoop
• Stainless steel brackets and flanges
• CNC machined breather adapters
• Custom EPDM flexible coupler
• Silicone couplers
• Crankcase breather hose
• Additional vacuum tubing and mounting hardware

Hybrid Airbox Only, reuse existing Eventuri intake (EVE-E46ABX-CF-PLM)

• Carbon fiber main airbox
• Carbon fiber airbox snorkel with MAF tube and CNC MAF boss
• Six thermoplastic molded trumpets with CNC stainless reinforcement rings
• Stainless steel brackets and flanges
• CNC machined breather adapters
• Custom EPDM flexible coupler
• Silicone couplers
• Crankcase breather hose
• Additional vacuum tubing and mounting hardware

Engineering Details

The main airbox houses six trumpets and the breather connectors. It is manufactured from prepreg carbon fiber and is designed to resonate under load to produce the desired CSL sound. Long term reliability at the trumpet interface is ensured by mechanical fasteners and gaskets that maintain an airtight seal through heat cycles and vibration. The same method secures the breather adapters.

The trumpets are injection molded from glass fiber reinforced thermoplastic to achieve precise geometry and smooth internal surfaces. CNC stainless rings prevent deformation when silicone couplers are tightened.

The snorkel channels airflow from the intake into the trumpet area. It incorporates the MAF tube where the OEM sensor mounts to a CNC machined boss. Custom screws engage plastic clips so the snorkel remains secure under vibration.

CFD Optimised Development

The airbox shape was refined through iterative CFD simulations to ensure each trumpet receives adequate flow without starvation from geometry limits or turbulence.

Patented Filter Housing Technology

The carbon pod shrouds a reverse mounted bespoke dry filter and reduces cross section smoothly toward the plenum. This invokes the Venturi effect, accelerating airflow while maintaining laminar conditions and reducing pressure loss through the system. The smoother flow into the MAF section allows the sensor to operate without errors.

Cold Air Scoop

The 100 percent prepreg carbon scoop with CNC machined collar locates in the front left brake duct. It saturates the intake mouth with ambient air while leaving half the duct height open for brake cooling. After a hard drive the aluminum cowl at the intake mouth will still feel cold to the touch.

Fitment

• BMW E46 M3, model years 2001 to 2006
• S54 engine
• LHD and RHD compatible

Technical Highlights

• Prepreg carbon fiber, autoclave cured
• Patented Venturi filter housing
• CNC machined MAF boss and breather adapters
• Stainless hardware and reinforcement rings
• Gasketed, mechanically fastened interfaces for long term sealing

** This item is not eligible for return **