Alright, obviously this isnt very possible but i want to cut out as much rattle as possible. I already have a single layer of Dynamat and its not working. My rear bumper is rattling like crazy, trunk is rattling, rear-quarter panel basically everything from the C-Panel back. Iv been looking into SDS, a good cost effective choice.

Im guessing my best bet is MLV tile but im not really sure if ill need anything else?

Also, iv heard to eliminate quarter panel rattle is to use a shaped piece of MDF and spray foam.

Tell me what you think. Total noob when it comes to deadening. Help me out.

The CLD tiles absorb and reduce vibration in the body panels. The MLV creates a barrier to reduce the sound coming in from the outside and music getting out of the car. The CCF is a layer in between the two that "decouples" the materials. The system REALLY works very well. I suggest checking my build log here for some great pictures showing how it works.

Seriously harsh rattling like you're trying to remedy is caused by these panels and parts vibrating against each other. The CLD tiles, CCF and MLV will be necessary to get it as quiet as it can be. However the quickest way to start the process is by identifying each place there's point of impact and insert something (like CCF or weatherstripping) between them to cushion it or in the case of the trunk lid tighten it up so that it can't move so much in the first place. The bumper cover and quarter panels will be tougher as they're not easily accessed, but they are doable for sure. The amount of work it takes to find and fix every rattle is truly a pain but very much worth it in the end.

I haven't quite got the picture in my head of exactly what is being referred to doing on that shaped MDF panel and foam but with I do not see that being a good or permanent solution.

MLV is really for blocking sound. All of these products are meant for noise reduction or sound quality installations. Not saying a vehicle can't be multi-purpose but if you are generating enough pressure to distort panels you pretty much have to accept the vehicle being disposable. Bracing the panels is the best approach, so gluing MDF to the sheet metal is no unreasonable, I guess. Just realize that almost anything you can do to make a vehicle able to withstand the abuse will preclude any future body work. short of sheet metal replacement.