Well, it'll affect the structural integrity of the rear deck, but I don't think it's anything to worry about.
one 15"zcon on 3000 watts
I'm probley wanting to do either square/rectangle port with mdf or use just pvc cause I'm going to be making a lot of them to get the tuning right and keep one for daily and one for burps
You think that much for 4 cubes
You could probably get away with less, but like I said, general rule of thumb for 4th orders is half cone area. I have 67.5 in^2 in mine and it's only 2.25cf. Definitely don't do less than 60. It depends on what you're tuning it to as well. The lower you tune it, the less port you really need.
I think I mite be able to get a 6 by 10 in the rear deck. How far do you think I need to keep the port away from the window?
I'm not sure. I've never ported through rear deck before. Maybe someone else can chime in on this. There's no way you could do a 6x12 port? 60 just seems a little small. How much power are you running again?
3000..
