first...dont be obnoxious with the bass. no one likes loud rattly cars, especially when its done intentionally.

now to answer your question, lol.

the loudest will come from facing the box backwards and as close to the back as you can get it without having the sub hit anything. this is called "slot" or "corner" loading. because of the small confines when waves emerge from the driver, they better align with each other rather than dispersing and bouncing all over the place leading to deconstructive wave interaction.

next best is up and as far back as it will go. after that is up and forward in the cabin, next is facing forward and pushed back, and last if facing forward and forward in the cabin. i did a lot of experimenting with this.


edit:

oh yea...for the taillight rattle, disasemble the trunk a bit and feel/listen to find out what is rattling. use a thin piece of carpet/fabric/foam/anything soft to slip inbetween the two pieces. i havnt found a fix for the wiper rattle besides removing it.

:shhh: i do cocaine :/shhh: