by FLUXEMAG » Thu Feb 09, 2006 12:58 pm
Air filters actually improve their filter performance to some degree after getting dirty. Engine filters need throughput, so they have to be replaced often. The 3M filtrete I know for certain works better after getting dirty, and it would last 3 months in a house before it gets dirty enough to start passing through defectivity. Your house AC or heater is working for more time per day than your car filter, so if you use a swag calculation, maybe once per year in the car.
IMO the 3M filter will out perform the Bosch filter, but when you rig it up make sure no air can pass through the corners and sides of it. Otherwise the air will just cruise around the filter. The 3M is also a directional filter, and needs to be facing the right way. I need a few of those for the house, so let's give it a shot.
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1967 Karmann Ghia Coupe, Rusty White
2005 Solara SE Sport V6, Lunar Mist
2010 G37 Coupe, Moonlight White