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MR12volt MOST integration
Select the optional Akrapovic sound kit for adjustable sound
The RS5/RS4 engine bay becomes heat soaked very quickly so simply having an open cone system would result in better airflow but with higher inlet temperatures
Lab tested at ~40%+ more efficient than the OEM cooler
Optimised weight for smooth gear-changes
Karbonius Carbon Fibre Airbox OEM Style - BMW E46 M3 / Z4M Civic (FK8) MR12volt MOST integration2x2 Gloss Only The CSL Airbox is one of the most demanded improvements among BMW M3 E46 enthusiasts. That is both for performance gain, and for the sound it brings to the car. On the other hand, it is a laborious, time consuming and expensive modification. For those who are looking for similar sound to CSL airbox, but do not look for HP gain, we have developed the Karbonius OEM Style S54 airbox. It is a simplified version of CSL airbox, that, apart