FI BTL Enclosure Placement question?

[wisemankw 0]

The trunk of my car( 1999 Pontiac Bonneville SSEI) has opening that connects the trunk with the inside cabin of the car. I was wondering if facing the port towards this opening instead of towards the rear of the car would increase SPL or hurt it. Will the air be pushed into the cabin of the car or will it just be trapped in the trunk bouncing around on it self.

I will prob end up leaving a gap of about 3" - 5" between the enclosure and the actual opening because the trunk gets narrow towards the back. Would I have to place the port directly in front of the opening or would having the port on one side of the box facing the front of the car matter?

Below is a pic of the actual trunk of a Pontiac Bonneville.