Got my sub kit (left side only) in a couple of weeks ago. Very well put together kit (thanks Sea-Scooby!) and sounds excellent, although I think I'll have to pull the window trim off at some point and RAAMat it as it does rattle that window a bit when it's cranked up! A second sub would be cool but I probably won;t go there to be honest as I find the pocket pretty handy for storinging a few tools that I want easy access to.
This is the JBL GTO804 Sub that I used:
And here's the finished install:
