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Heres some Level 5 15s next to the M38 for reference =] Enjoy =]

Now you just have to listen to it in a vehicle thats actually loud

All I have to save is this album straight up gets down. Every single track hammers.

That is a side effect, not the goal of a deadener. If you want to know how to soundproof a car, this is the best site (at the moment): http://www.sounddeadenershowdown.com/content/welcome-sound-deadener-showdown

damplifier is really only meant to be used on the sheet metal and the foam products are to be used from keeping 2 surfaces from touching or to "hold" a panel in place persay. You first need to find out the source of the noise you are trying to get rid of. If you have a system and it only rattles while thats on then turn on the system and go to the hatch area and see if you can find the rattling (might be hard in that situation but it is what it is) If it only does it while driving on a certain bad road then get someone to drive you down that road while you are in the hatch area with the music off preferably. You want to just hold your hand against whatever you think is rattling if it stops then you found the source if not try again. If you weren't able to locate the source with the panels on try with the plastic panels off, it could be the sheet metal. Just remember that nothing you do can really hurt (applying damplifier or foam products). There are certain situations that you cant do much to help but those are pretty uncommon. If you get to the point where you figured out there is a piece of plastic flexing causing the rattle and you cant really add foam to the issue then try the damp pro on the panel. Its not going to work like its made to but it will add some weight to the panel and hopefully lower the resonance freq of the panel.

I have been chasing rattles in my GF's Equinox for months! I have used everything from spray foam to t-shirts...lol. Stop one rattle and another pops up.