What is a good sound deadner ,to use ?

[JumboAMONGus]

iam searching for sound deadner my original mats were so crumbly they were almost gone ,, i have the original cardboard top section but looking for something on floor im running flowmaster 40 series 2 1/12 exhaust and gets annoying with no carpet in it , i seen peace maker fatmat and a few others and also who makes a good qaulity carpet that fits real good , along the doors and goes all the way back to where tank is ? thanks for any info