Originally Posted by Kadarin
My real concern would be in knowing how effectively it filters dust and other contaminants. More airflow is great, but not if it's going to adversely affect the longevity of the engine.
+1, there has got to be a reason for putting that charcoal into the filter and the extra density. Why on earth would M gmbh go through all the effort they did to make the engine what it is and this car what it is to then rob it of performance with a more restrictive air filter unless it was necessary?