i know this thread is a month old, but i'll throw my experience in since i have done the exact setup......... only thing, i used a full crawl-through on my 86 yota. original first release L7-15's in a chambered 12cu. vented box. the double-blade wipers were bouncing 1/2" off the windshield, and the sunroof moved 1.5".......all off a mere soundstream 1000sx 142.1db @ 27hz (which was what i was going for at the time, btw).....there is huge potential in the "music" level...... in blow-through reversal, i have re-welded the old piece, and simply installed new sheets