oh, and yes the dynamat will be next to impossible to get off, and will leave all kinds of black adhesive behind. Better off trying to get into the service holes without taking off all of it IMO. If you do go to replace some or all of the dynamat, take a look at raamat
RAAMaudio - Quality and Value in Automotive Sound Deadening
It's every bit as good as dynamat and cheaper. Also, the foil backing won't cut you like some of the dynamat varieties can. Someone did a very exhaustive sound deadening review and this came out on top all things considered. I have been very impressed with it myself.
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94 LC, 110K, FOR 3" lift, Nitto TG 315's
88 Mini truck, SAS'ed
86 LC, 150K, OME Medium, ARB front, custom rear bumper, Warn 8274, BFG 33" Muds - back to shmukster
And a silly little VW TDI Jetta Wagon that does 50mpg