A few weeks old, but no one has helped, so I will voice my opinion. As stated before, two 15s will be a challenge in a trunk, to play efficiently. I couldn't find the exact subwoofer recommendations for that sub, weird that the manufacture has not published that information on the site. Aero ports can help save up space to run a ported enclosure. But seeing how much space you will need for two 15s plus the ability to daily tune will be far fetched IMHO. The tuning freq you referred to by hz is not a pre-determined number. The enclosure size as well as aimed tuned frequency will determine the length needed accordingly. I will first post up some deminisons of your trunk that you are willing to sacrifice for this installation, then we will go from there.