This will be my first year competing in meca. I was also wanting to hit a few local dbdrags too. I am completely sealed off in the front and back. I just finished my build yesterday. http://www.stevemeadedesigns.com/board/topic/126066-mazda-323-wall-build/page__p__1775338__fromsearch__1#entry1775338 . I also am very disappointed. I tuned the box to 36 hz. But I have absolutely no lows. Again, I still need to put it on a termlab, but I played young Jeezy's "Put On" and I'm pretty sure my 6.5's have just as much bass as the 15's do that low.