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Message: <blockquote data-quote="morpheus5039" data-source="post: 333650" data-attributes="member: 6539">How about we say like this? K&N and etc is better in typical car cos their stock paper filter quality is OK only so there is more restriction over aftermarket one.But... BMW leh...!! So their stock paper filter(or OEM) quality is very high! Thus there is little restriction(Neglegible) , and u can hardly feel difference between stock and aftermarket, so why bmwe34.net suggest retain stock(in this case, an BMW E34)Juz my own understanding though, still a long way to learn...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></blockquote>