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K&N DROP-IN FILTER TEST (Install / Sound Test / Acceleration Test) - VLOG9 - YouTube
ISO5011 Air filter testing PAPER vs K&N vs UNIFILTER - Project 200
Pros and cons of these k&n drop in filters? I've read mixed reviews about them would love Reddit's insight in these. i have a base model 2015 370z with 69,xxx miles :
Dyno Results K&N Panel Filters - BMW M3 and BMW M4 Forum