Well, that BMW I was referring to has the two MMATS Mojo 12's completely enclosed running off of 1800 watts and blowing through only a 3" tall by 8" wide port (if I remember right) has held up with no problems for at least 6-8 months. To top it off, this client loves it lound and he spends tons of time in his car so I would figure it has taken one helluva beating in that time.

Still trying to find pics of it to post for reference. They're not in photobucket so I'll have to go through the shop library tomorrow...