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      06-16-2009, 04:54 PM   #3's Avatar

Drives: E64 M6/E90 335xi
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Originally Posted by RL in Florida View Post
It looks like most of the High Performance Air Filters improve air flow by eliminating the Charcoal Stage of the filter, and using just the large particulate filter (paper/gauze/oil).

So, whats the charcoal there for? Remove hydrocarbons? Remove water?

I am looking at purchasing a high performance filter, but I'm just not wanted to take chances on causing engine damage if the charcoal actually is important.

Thanks for any input
I think it depends on which High performance filter you go with. I know the APE filter and the MS filter out ~99.39% of particles. Companies like AFE and others that use dry filters, don't filter as much. OE filters filter out about the same as ours, but are more restrictive on airflow.

Hope this helps