E46 M3 Carbon Airbox OEM Style - Karbonius
E46 M3 OEM Style Airbox made by Karbonius.
New from November 2022.
SL Airbox is one of the most demanded improvements among BMW M3 E46 enthusiastic. That is both for performance gain, and for sound it brings to 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 a louder sound to the engine (+12 dB compared to plastic OEM), it gives awesome appearance and easy installation using the stock elbow, air filter and MAF sensor.
There is no need to install any additional hardware or have a remap.
*In SMG version, need to install genuine BMW CSL SMG Expansion Tank – RealOEM ref 2153228254949)
Regarding power increase, Karbonius got +4HP in recent dyno test comparing with OEM airbox.
Not really significant considering that dyno can have a 2% margin error. But in conclusion, and pending new test in future, Karbonius can say no significant power increase and certainly no HP loss.
As usual, piece manufactured 100% in carbon fibre prepreg, cured in autoclave in Spain (Karbonius HQ) under strict quality requirement.
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