wich one do you think will work best of this plans? sub back and port to side, a straight pipe like the first pic? or if i make a little angle so the pipe will pointing to the corner little more, or another plan i have was like in the third pic, i was going to make the box from a 273mm stainless steel pipe, and put the 6" aero indide it, all boxes will be 1,25cuft before sub and port