I used dynomat in my previous car (camaro) and it really works wonders but i remember that it was pretty steep as far as price goes but i cant remember what i paid off the top of my head (got it at Bestbuy)...my hatch trim pieces were rattling like crazy too but i stuck some pieces of cloth inside and made sure all the clamps were secured and after that everything is quite from the outside...as far as the rattling around the tail lights I would take off the back panels to make sure everything looks tight....i actually found a nickle behind mine...good look..btw i have a jl 12w6
