I have a 2013 EX-L sedan. The rear sear is not split other than the center cup holder/arm rest fold down. I have a car seat so I cannot folw down the rear at all to have a port into the trunk. I have a 15" sub in the trunk and would like to make a cutout in the panel behind the arm rest to allow more bass inside of the cabin. Has anyone done this? If so, do you have any advice or photos? Thanks much!