Nice...what did you have before? I too listen to mostly rock/metal/some emo/alternative and I love bass. I will listen to rap as long as it has a great beat such as Jay-Z, Ludacris, Snoop, Dre, etc.
I currently have 2 Alpine Type R 12s in a dual sealed box and that BANGS in all my other cars...just haven't put it in the STi yet. But I love trunk room cause I play a lot of soccer, so you're idea might be a viable one...
sorry to be a pest with it, but have you tried with the arm rest put back up covering the Sub?
I would imagine its easy as it looks it...easy to secure the board to the pass through?