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Answered 2008-06-05 22:39:40

K&N part # KN-144 Seems to be a little better flow, and does catch a little more 'crud' Yamaha part # 1L9-13440-91-00

ELEMENT ASS'Y, OIL CLEANER Note that as far as I've been able to tell, all xs400's used the same filter.

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