Long story short, I had to pull my headliner out yesterday for a separate project. While it is out, I am tempted to order some dynamat and slap it all over the roof. I was just wondering if anyone else has done this to their X and if it made a difference in road noise, etc. For the record, I am quite familiar with dynamat and have fully covered the inside of many previous vehicles I've owned. I am mostly wondering if it makes much of a difference in the Xterra to do JUST the roof, as I wouldn't be pulling door panels off or pulling carpet out to install it everywhere. Is it worth the time and money to do just the roof?