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For cars with a trunk, rear facing sub, rear facing port is the loudest configuration. The absolute best way is to have the box about 6 inches from the trunk lid, because that minimizes cancellation as the sound waves reflect off of the back of the trunk and into the cabin of the car.
Most people don't do this because then it means that your trunk space is behind the sub enclosure, and it results in really bad trunk rattling.
For someone like me, I can't stand trunk rattle, and I don't like that a lot of the sound gets trapped in the trunk, so I like the idea of removing the rear shelf speakers (if you have them) and building a bandpass box that ports through the speaker cut outs in the rear shelf. It puts all the sound in the cabin and you will have no trunk rattle.
The downside is that you have to have someone that really knows how to build these, or it will sound like garbage.
If you want to do it all yourself (which I recommend - its great experience and a fun way to spend a weekend), you can go on a car audio forum and have someone draw enclosure plans for you, which will typically list how much wood you need and a cut sheet showing the dimensions for each piece. You can usually get plans for $15 - 20, which is a win-win, because you are learning to do it yourself, but it was designed by someone that knows what they are doing. Or you could have someone build and ship you an enclosure, then you can do the installation yourself, which is the route I typically take.
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