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Old 11-15-2012, 05:45 AM
rawn0417 rawn0417 is offline
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Location: maryland
Join Date: Oct 2012
Posts: 18
Mein Auto: 530i
should you upgraded the air filter?????

I have a 2004 530i and i was wondering what’s the better air filter to replace the factory one with K&N or AFE??? and recommendation?? Has anyone notice any mpg improvement once doing this?

Last edited by rawn0417; 11-15-2012 at 06:39 AM.
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