My "Nightmare" is louder than i like so i decided to sound deaden it by laying (5) sheets of Blackhole on the entire roof and back wall. It as made a substantial difference but not enough as i plan in the near future to do both doors to further improve the cabin. It was a much bigger job than expected but with great results. High quality material, no ash fault, no petroleum smell. Take your time doing it and peel off the wax paper as needed to alleviate any mistakes (once it grabs the surface it's hard to re-position it). Everyone was helpful and responsive. Great company to deal with.