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It appears these are completely different from the intakes on the N63 50i...
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". This could be contributing to the 150hp difference between the two engines as it appears to be significantly more restrictive...
I did a quick search online and haven't found any aftermarket filters or intake systems for the 50i. Looking at the realoem diagram, now I know why.
Time permitting, I may dive into the airboxes this weekend to get a better understanding of what the filters look like and how they are held in there...
Below is the filter element outlined in red.
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