I have two Stereo Integrity Magnum D2's and want to port them very badly. I am looking for SQL about 60/40 SPL to SQ. Ill be giving each sub 800 true watts. This will all be going in the trunk of a 2000 cavalier. The biggest box I can fit in their is 30w x 15h x 16d. I want to tune the box to anywhere from 30 - 35hz if possible. What is the biggest box I will be able to make to those dimentions and what will it be tuned to? Will I have to use round ports or is it possible to use a single slot port. If round will there be any port noise and if so how noticible will it be? I am making box by tommorow so I would appreciate responses as soon as possible. Thanx.