Here you can see where the butyl has stretched, easily cut with a sharp knife:
I was surprised by the butyl rope used to separate the door brace/safety-bar from the outer door skin.. nice! This saves me from buying the butyl rope..
After the vapour barrier and speaker (only 3 screws hold it in place) have been removed and everything wiped clean with paint thinner (for best adherence of the damping mat). I cut and applied the RAAMmat to about 75% of the outer door skin. I added an additional layer of mat (about 8"x8" square) behind the speaker driver location. I lightly tapped on the door and other bracing, listening for ringing or anything that would have rattled (using odds and end pieces of the RAAMmat here):