i have a 95 bmw, and the problem i have is that i loose alot of sound because of bmw trying to seal off the trunk. i have image dynamic ID Max 12" sub, audiobahn 1800 watt amp. bought i crappy wal mart box and it just isnt cutting it, so trying to decide weather or not to go enclosed..big,medium,small box/ or ported? drop me some advise if you have had this problem. has any one ever tried putting a sub in the arm rest in the back seat of a bimmer?