I'm not sure if diesel engines need to worry about too much back pressure or not. Unless you really constricted the exhaust flow. Could you change the torque curve with tuned exhaust?. I rode in a buddys 2005 Chevy with the big diesel in it and was impressed by how quiet that thing was. So they have done something right with that exhaust system. A good quiet muffler doesn't have to be huge. And going dual exhaust could decrease the size of a single muffler.. Keep in mind that exhaust temps seem to be higher in diesels so that would be a consideration. Geez I wouldn't have to wear ear plugs if my little Kubota had a decent muffler.
Mjncad if you want to quiet your computer down get one of the super quiet fans that they have out. Better yet they have computer chillers that cool the system sort of like a refridgerator. The fan is the noisiest part of the computer. Sound proof material helps. Here at work we have to change out fans when they get old an noisy on electronic equipment.
Woodlands this is a good topic thanks for bringing it out. I would like to
HEAR how it ends up.
