Originally Posted by CanAutM3
North American M3s had a different air box and a more restrictive charcoal lined filter compared to the European models in '08 and '09. Starting in '10, NA models got the same air box and filter as the Europeans.
We didn't get separate charcoal filters here on the M3. That was the E60 M5 that had them.
I have the euro airbox in my 08 M3, same thing as the US one other than the adapter issue.