I also spent some serious time cleaning this morning- shop vacced everything, hit the car wash, used the clay bar, detailed the rims, armour-alled everything.
Last night, my wife wanted to go to Joanne's (the craft store) and I was just kinda wandering around when I found sheets of 1" foam, on sale 50% off. I picked up 2 yards and last night, me and a friend cut out pieces and used them as baffles in the door panels. worked great. I put some rubber backed dampener under the rear hatch area, but the msp exhaust is still pretty loud. I'm going to start working on a new rear floor, and I'll use the left over foam back there.