My buddy did his whole cab and it makes his truck so much quieter and nothing rattles when he turns on his L7. **** was expensive but he is glad he did it
dunno where u are on this but on my truck i used low pile house carpet with the thick grean foam stuff under it, my truck is alot quieter now. also instead of using dynomat, you can use peal n seal, which is the same thing, just u can get a giant roll of it for 30 dollars and home depo sells it just ask for gutter tape, i beleave