Karbonius carbon fibre CSL Style Airbox for the S54 engine as found in the E46 M3, late Z3 M and Z4 M.

This airbox has been developed for maximum performance and uses Karbonius’ renowned quality control and construction. It is made in 100% pre-preg carbon fibre, autoclaved at Karbonius’ facilities in Spain under ISO 9001 standards. This leads to the best finish available today, as well as perfect thermal and structural stability. This airbox is one of the best available on the market today, closely replicating the original BMW airbox but with a number of improvements:

• Trumpets made in carbon fibre instead of plastic for further weight reduction
• Improved shape and diameter of the trumpets – 51.5mm instead of 50mm and better airflow through shaping improvements
• Exclusive sixth trumpet design – usually the rear trumpet suffers with reduced airflow, Karbonius have improved this, finding genuine performance gains
• Smoothed airbox interior for reduced turbulence

Karbonius also include CNC machined brackets and fixings, and put a lot of attention to match the weave in the different areas of the intake. This means that your airbox presents a perfect match between both sides, which also creates a hermetic seal with a neoprene foam gasket between the front/rear sections. All Karbonius pieces are numbered, so its origin and authenticity are guaranteed.

This airbox does not include air filter or snorkel, available separately.

Lead time of up to 8 weeks when on back-order. Contact us for the latest lead times.