i just saw an experiment like this on mythbusters, i think they used some kind of pea plants. But i can't remember how it ended, i think the plants with heavy metal did best. I figure ya throw on Somthing with really low bass, i'll just put some subs in my cab and vibrate the old air out, LOL subwoofer port as a ventilation solution. Sounds funny and i won't be trying it but hell, i bet it could be made to work, they damn sure move enough air around. However intake and exhaust would be the same place i guess. LOL i'm high