E46 M3 CSL Carbon Airbox - Karbonius

E46 M3 CSL Carbon Airbox - Karbonius

E46 M3 CSL Airbox made by Karbonius.


This is by far the best Carbon Fibre Airbox we have seen and dealt with in the past and the attention to detail is almost identical to the Genuine BMW AG E46 M3 CSL Airbox supplied by BMW, manufactured by Die Wethje.


These boxes are made from the finest quality Pre-preg carbon fibre 2 x 2 twill material which when completed makes these boxes ultra light and rigid.

After the moulding process is finished in the state of the art Aluminium mould the part is then left in the Autoclave and this process is the finishing touches to a truly superb piece.


The 'M Power' sticker which can be seen on the top of the Air collecter is supplied with the Airbox.



Option 1

Plastic trumpets version: This is the same airbox but with plastic trumpets (same as the OEM CSL). This goes with 2 year warranty. Airbox is cured in autoclave at 120ºC and 3 BAR prssure.


Full carbon trumpets: This piece comes with 5 year warranty. Airbox is cured in autoclave at 135ºC and 5 BAR pressure and has 1 extra varnish coat applied.



Option 2

Control Unit (Snorkel) - Made by Karbonius (No flap) - Carbon

Control Unit (Snorkel) - Genuine OEM BMW M3 CSL (Includes Flap/ Actuator motor/ Throttle Sensor) - Plastic ABS -

1x 11617833498


From July 2020 we now include 4x FREE Genuine BMW (black) bolts 07119901780to fix both OEM CSL and Karbonius carbon snorkels to main housing (unfiltered part). 


Option 3

ITG Filter: Germany has claimed 2 BHP more with this filter, and it's preoiled and washable

OEM CSL: Genuine BMW M3 CSL Air filter. Manufactured by BMC - 13727838625


Option 4

Fitting this CSL Airbox you need the following parts from BMW to fit both Manual & SMG E46 M3s.


Air Valve shut off - 

1x 11617833647 

CSL Crank Case Vent Hose - 

1x 11157833649

CSL IAT Sensor - 

1x 13621739510 

2 pole socket housing for CSL IAT Sensor - 

1x 12521427615  

90 deg protective boot for 2 pole socket housing - 

1x 12521732635



Option 5

No Dipstick - Use your standard OEM M3. Must require bending into shape to avoid contact with CSL Airbox.

Genuine BMW OEM CSL Dipstick. This is short and fits underneath your airbox. Comes as 2 parts - Guide tube & Dipstick -

1x 11437834784 & 1x 11437833653


SMG Vehicles: 

You can purchase the SMG tank and bracket seperately >>HERE<<



If you prefer your Karbonius Airbox to be manufctured in 1x1 carbon twill (instead of the standard 2x2 weave) then please message us after ordering. This is a FREE alternative. 


If you require additional parts such as air feed components for CSL Front Bumpers or Control Unit flap to be operational then please get in contact with us......

    Control unit (Snorkel)
    Air Filter
    Airbox Parts
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