So I'm installing a Xcon 12" and was wondering what would be the best placement of the sub and port? Size of the box and tuning? Or if I should so sealed and ported? If ported what type of port? It is going in a 01 eclipce hatchback!

Ported if you have the space, sub up port back, slot port if you have the space if not then aero port, 2.75 cuft @ 34 Hz.

I should easliy have the space now straight up or angled with the back glass? And how much port opening? And the ratio on the port?

How much power you have available? Straight up.

Check out the pre-designed enclosures here to give you ideas on your port http://soundsolutionsaudio.com/index.php/product-information/xcon.html

It would be better for the port to run at the bottom of the box in the center, then turn on the back wall, as opposed to the corner, if the design allows it.

I have A brz1700.1d going to it. So a square port in the middle on the bottom?

Rectangular port , 13'' x 3''

Something like this with one sub, but it may also turn at the back wall going up.

Okay I see and u would have the box rectangle not angled?

Yep you got it..