Thread: Z4 M Coupe Dyno
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      12-03-2014, 11:45 AM   #8
inTgr8r
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Quote:
Originally Posted by fullerra View Post
There is a carbon filter in the stock air box on North America versions. I'm not 100 percent sure why it's there in addition to the air filter. I took it out many moons ago with no ill effects.
It's emissions related.
There are several old threads on this topic, I don't recall all the details though.
But there really isn't much if any performance impact to having it there.,
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