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Karbonius Carbon Fibre Airbox OEM Style - BMW E46 M3 / Z4M

Regular price £1,499.99 GBP
Sale price £1,499.99 GBP Regular price
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SKU: E46AD09

Fitting Available - Please email for a quote.

2x2 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 from louder sound to engine (+12 dB compared to plastic OEM) gives awesome appearance and easy installation using stock elbow and MAF

No needed to remap

*Need to install with CSL Crankcase breather hose (RealOEM ref: 11157833649)

*In SMG version, need to install genuine BMW CSL SMG Expansion Tank – RealOEM ref 2153228254949)

*Additional parts (hoses, clamps) could be required to do installation.

Regarding power increase, we got +4HP in recent dyno test comparing with OEM airbox. Not really significant considering that  dyno can have a 2% margin error. In conclusion, and pending new test in future,  we can say no significant power increase and no HP loss.


• BMW M3 E46
• BMW Z4 M

As usual, piece manufactured 100% in carbon fibre prepreg, cured in autoclave in our facilities in Spain (EU) under strict quality requirement and for qualified stuff