Originally Posted by bmobile
Hi Tom, I have an '08 m3 and the filter is for +'10 models. My understanding is that the adapter is for +'10 US m3 models to allow proper fitment for '08-'09 oem air filters...
There is no such thing as an Euro airbox. The differences are as follows:
2008-2009 US M3: Charcoal Lined Filter
2010-2013 US M3: Paper Filter
2007-2013 EU M3: Paper Filter
S65 M3 Charcoal Lined Filter (US)
S65 M3 Paper Filter (US & EU)
Macht Schnell EU Air Filter Adapter
EU versions always had the paper filter design, even in 2007-2009 models. Also, the centering pin length is shorter on M3s equipped with the paper filter.
If you have a 08-09 M3 with the charcoal lined filter and would like to use the filter you have (10-13), simply replace your centering pin in your airbox with the Macht Schnell unit and you will now have the option to run either filter.
Hope this clears up the confusion in the thread, feel free to contact me directly if you have any further questions.