My 936A2 hard top is now straight piped. Im already hard of hearing bc of 6 yrs in artillery on M109s, and the last 20yrs in aviation. I can tell a difference between muffled and non, but its not enough to bother me. Operating the crane though, i need ear muffs.
Iv been thinking of replacing the army oem “sound proofing”, but it isnt high on my list of things i need to do with the truck.