All this talk got me looking.. I stumbled across the following.. What do you think?
http://mobilesound.tripod.com/sound_deadening.html Sounds like a bit of overkill, but I bet it's Lexus quiet now.
Hey Steven, did you apply the dynomat after you already had the sub in the car, or did you do everything at once? Just wondering if you had the outside rattling before because of the sub, and if the dynomat stopped that.