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Ok I'm similar in thinking this would not do much but I have an 08 550 and I can feel a difference, not earth shattering but definitely a difference in idle and shifting. It seems to be more responsive on acceleration. There is a slightly louder note to the engine "maybe I'm imagining that part". I spoke to a Dinan rep today at my local BMW dealership and asked him if he heard of this Mod. He said its a US based emissions thing and it will not hurt my car if removed. He did also mention that Dinans air intake system effectively eliminates the carbon filter along with a new intake box etc...
When you remove the filter you can clearly see why it can restrict the airflow. Without it there is much more room for flow.
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