I have a 16 cf trunk,
the box can be a max of 20 inch tall, 36 inch wide, 36 inch deep. But, i dont think you'll need to use THAT much space for 2 8" subs
Sundown recommends .6 - 1 CF per sub. I was thinking 1.75 for two.
tuning wise, Sundown recommends 30-40hz. I thought 35 for the middle of...