Thank you, I have seen some youtube videos with some expensive custom jobs and 2x10" under the lid with ni mods to the lid and saying if there is "enough" space between the subs and the lid the air will move around without rattling. I guess one way to find out).
One other thing is that i would want to buy a good sub and keep the sub after I sell the car in a couple of years. This leaves me with generic shapes whether pre built or custom. It may be that I end up just putting it in a trunk. Would prefer to avoid it. Whats worse compromise, design flaw with a box in the trunk or buying a sub I dont want just cause it fits. Decisions...