I'm doing a 15 on the passenger side and a huge port on the driver side in a dodge intrepid. I'm hitting around a 147 with some room to improve my score. Port on drivers side is generally louder. When you seal it off make sure that everything is nice and tight. If you can I would do some testing to establish your resonant frequency. Don't wait like I did and then have to retune after the box is all mounted and sealed. Trunk systems USUALLY peak in the mid 40s but that isn't always true. If you are going for spl then the 33hz tune you have now will need to be raised. You can check my install out here:
http://audioforum.termpro.com/topic/40/24075.html#000012
Another nasty loud sealed trunk with 2 subs. It's a long read but the guy is hitting a 150+ with 2 tens:
http://audioforum.termpro.com/topic/40/23754.html
