will there be any difference in sound if my sub box is not extreemly tighly stapped down to be seat.? i can get it to where it stays in one spot but due to position and size i would have to drill holes through my seats to make it rock solid strapped down.

Nope. If it moves around, then yes, you will hear a difference because it won't be shifting in your trunk anymore.

I have actually heard that with the enclosure not being coupled to the body itself, you are losing a bit of efficiency. Is it audible, unlikely. Like I said, just something I heard.

yay i found a way to make it very solid tight to the seats its sitting on without drilling holes in the seats lol. thanks anyways. i smacked my self for not thinking of this befor.