I just spent the last month tearing apart my entire car and dynomated the entire thing. I removed the stock 6x9s in the rear and relocated my new diamond hex's to the 1/4 panels, if you want to reduce compression in the truck (which causes rattling) and increase bass in the cab i recommend moving your speakers in the rear as well and leaving as many holes into the cab open as possible. pressurizing your trunk will just blow out those 6x9s you throw up there i had to put rubber under my licence plate, the wing, and i still have to figure out something rattling underneath the car and probably put rubber there. basically anything that comes in contact and not really tight needs rubber or dynomat applied. or your gonna have one of those ghetto cars that shake like a b****. just sayin from my experience thought it might help