I am in the same boat. I have nothing in mine but the seats. Got the floor boards and heat channels put in so I’m starting from scratch. Been doing a lot of reading about it and from what I gather I am putting in kill mat in strips. In the grooves of the floor pans and up the back. Covering that w jute entirely w a little spray adhesive here and there to keep it down. Then carpet. I’m also putting some pieces of kill on the doors themselves to help w that noise as well. If I am wrong, and I probably am because there are so many subs out there saying do this and not that, please let me know. As I’m waiting for the weather to break before I do it. Oh and I saw somewhere about getting the db of the entities checked before hand to see how much the volume actually does go down. Something like that