already dynomat'd the floor, it made a very slight difference to me, but hey, something is better than nothing
Also, I just checked and the muffler is a magnaflow, I have to believe that's still a flowmaster product, perhaps the least restrictive product they offer? either way, I am resolving to either replace the muffler or stick some noise diffuser into the tailpipe (see LDub's's prior post in this thread)