I just got my brand new DC Level 4 15" sub today and Im going to put it on my DC 3.5k for daily use along with competing in spl. I have a 1991 Nissan Maxima and was wondering if I could get some box suggestions, (on net volume, port size and length and tuning frequency ect..). I'll be overpowering it by quite a bit so I wanted to make sure I made the box right. I was thinking something around 3.25 cu.ft. so itll fit in my trunk. Thanks.