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They are very similar, some choose K & N, others Pipercross.
I have the Piper and I think the holes are slightly bigger letting more air through, and it sounds good too
But it could all be in my head, LOL.
Cheers M.
I too have the piper fitted. I did a lot of reading before choosing, and as Mick has said, it seems to be a matter of personal choice, but I found that generally, it appeared that more people thought any improvement in performance was minimal, and that the piper was slightly preferred for this purpose. I am happy with mine.