so i bought a 3m filter thing today. I was wondering if I also go and buy the carbon one(charcoal) and use both, will it still work? and how do I set it up. Hate the smell of cow poop in bakersfield, especially during the summer and the burning of the fields.

 

i would just go with the charcoal filter, i dont know if doubling up like that will decrease flow rate and cause a problem, u should stick with just one of them, and besides if it smells like poop outside hit the "circulate" button to circulate the air already in the cabin, this way you wont have outside air enter the cabin...theoretically at least

 

yeah, its theoretical, cause air seems to get into the car someway. Drive by a cow farm, and damm, the inside only circulation button doesn't do jack.