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IMHO, the cabin air filter is a marketing scam. I breath the outside air unfiltered all the time. Why do I need a filter when I'm in the car?
Seems like a good idea to me. The dry air and Santa Ana winds means lots of fine dust and debris on the road, that gets kicked up by cars moving at 65mph +. But yeah, an easy DIY project.
Someone needs to invent a motorcycle helmet with a “ cabin air filter” ;-)
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