Quote:
Originally Posted by EldRick
Just buy a K&N drop-in filter, and let it go at that. You probably couldn't measure a difference in performance between the K&N and the other anyway.
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Yep.
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'07 Z4MR '22 GT4 '18 GT3 '16 GT4, '16 M2, '14 X1, '13 135is, '06 330i, '03 323 Ci, '01 330i, '99 M3 (RIP), '96 318is, some non-BMWs
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