TahoeM3,
The filters on the N63 appear to be embedded into the center of a molded panel inside the airboxes. Completely different system from the S63 on the "M".
I searched online and haven't found any aftermarket filters or intake systems for the 50i.
I agree that with detailed diagrams, part numbers and pictures of the S63 intake this may be possible. I will search for more information. Ideally, if we had a bimmerpost member with an S63 willing to help with this effort that would make things a lot easier.
Below is the stock filter element outlined in red.
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