Karbonius Carbon Fibre CSL Style Airbox BMW E46 M3

By Karbonius
From £1,955.00
Made to Order – Lead Time TBC

Karbonius CSL Style Carbon Fibre Airbox – BMW E46 M3 (S54)

Bring the legendary sound and performance of the BMW M3 E46 CSL to your S54 with the Karbonius CSL Style Airbox. Hand-built in Spain from 100% prepreg carbon fibre and autoclave-cured, this intake is one of the finest CSL-style replicas available today. With carbon trumpets, optimised airflow geometry, and a weight of just 1.7kg, it delivers sharper throttle response, an intoxicating induction roar, and measurable power gains – while replicating the iconic CSL look under the bonnet.

Why Upgrade?

Iconic CSL DNA

The CSL is legendary not only for its chassis, but also for its unmistakable carbon airbox sound. This Karbonius system recreates that experience while refining it with modern manufacturing techniques. Benefits include:

  • Appreciable power and torque increases (up to 25hp depending on tune)

  • Sharper throttle response for immediate driver feedback

  • The famous CSL induction sound that makes every drive an event

Performance Enhancements Over OEM CSL

Unlike the original BMW CSL airbox, this Karbonius version introduces:

  • Carbon fibre trumpets instead of plastic – reducing weight further

  • Enlarged 51.5mm trumpets (vs. OEM 50mm) with rounded inlets for smoother airflow

  • Redesigned 6th trumpet, improving airflow balance and delivering an additional ~1hp gain

  • Smoothed and varnished internal surfaces to minimise turbulence and improve response

Motorsport-Level Construction

  • Prepreg carbon fibre cured in autoclave at 125°C

  • CNC-machined, anodised aluminium fittings

  • Stainless steel hardware

  • Perfect carbon weave alignment for premium aesthetics

  • Hermetic seal achieved with neoprene foam gasket

Key Features

  • Appreciable power gains and torque improvement

  • Up to 25hp potential depending on mapping

  • Legendary CSL induction sound

  • Carbon trumpets for improved airflow and lightness

  • Exclusive and numbered for authenticity

  • High-gloss UV-protected finish

  • 5-year manufacturing defect warranty

Compatibility

  • BMW M3 E46 (S54)

Installation Notes:

  • ECU remap required

  • Professional installation recommended

  • While designed for OEM-style fitment, minor adjustments may be necessary

  • Track and race applications – road legality varies by region

What’s Included

  • Karbonius CSL Style carbon fibre airbox

  • Ventilation valve bracket

  • Certificate of authenticity
    (Air filter sold separately)

Why Choose Karbonius?

Karbonius Composites are world-renowned for their meticulous craftsmanship and motorsport-grade carbon components. Every CSL Style Airbox is built by hand in Spain under ISO 9001 quality management standards, individually numbered, and backed by a 5-year warranty. With customers worldwide and a reputation for unmatched fit and finish, Karbonius products are a benchmark in BMW aftermarket carbon fibre.

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