Just finished doing on my driver side door earlier this morning w/Dynamat Xtreme (can't beat 1/2 off retail for it), but I didn't know what to do about the last layer on the inner door panel... I was skimming posts, and saw placenta write about the covering of the large door panel holes not being effective without a piece of aluminum to cover it up. I'm definitely not going that extreme on my install, and was wondering what the general concensus was. Also, are most people doing 2 layers on the inner portion (the backside of the exterior of the car) or just 1? How about for the inside? I'll post pics later on of my progress.
Thanks for the input!