We've been working on an enclosure for the new Subaru Sti/wrx hatch, there are a few snags we have run into along the way, but one key element has helped us tons. The 10" slim line woofer from Exile Audio(link). This woofer has enabled us to build a sleek looking enclosure and still maintain the trunk space. The enclosure is in the mold process now, and we hope to have it out before the holiday season. Be sure to check the blog frequently for updated information.
Here's a few sneak peeks: