I have a Dayton Reference, Hi Fidelity sub, RSS265HF-4, 10 inch subwoofer. It is mounted to a custom made, 3/4 inch MDF box, sealed in a .65 cubic inch enclosure. It is custom made to fit into the STI or WRX trunk perfectly, mounted to the back of the seat. It doesnt take up much space, and sounds awesome. I only used it for a year, and the sub is 10/10 working condition, and nearly perfect in appearance. The only flaw is some mounting caulking on the back of the sub ring (But of course it remains mounted, so you can't see it). Othewise it is in perfect condition.
I will sell it for $80.00 for the sub alone plus shipping, or $130.00 for the sub and enclosure together, plus shipping. I prefer to sell it all as a unit.

http://i120.photobucket.com/albums/o167/subynube/daytonsub.jpg

http://i120.photobucket.com/albums/o167/subynube/subbox.jpg

http://i120.photobucket.com/albums/o167/subynube/completedtrunk.jpg

Thanks for looking.

EDIT: BOX AND SUB SOLD AS OF 4/11/07

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apres ski bump!!

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evening bump. Make me an offer...

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Sub box and Dayton sub sold as of 4/11/07.