I am looking at filling up the year with inexpensive (all relative) but labor-intensive projects for my Mach 1- keeps me occupied but lets me build back up the funds after 2018's weekly tooth-kicks. The end goal for the car is cruise-in shows and that's about it, but I'd like it to be comfortable and quiet on the interior. I love the idea of doing a full Dynamat kit on the interior, but I'm concerned if it's "too permanent." I know you can tear it off but it's a mess. If I dynamat the car properly, will it detract from value at all? Any negatives?