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You can go to most any muffler shop and have some custom made, plus they will probably have many catalogs to plunder through and see if you find something you really like.
Depends on you. Mine were just a bit noisy and at higher rpms I got an uncomfortable drone. Garret suggested an Aeroturbine muffler and it mellowed out perfectly. Price ranges from $450 to $750 depending on what you want. Go to www.blackclouddiesel.com and you can get a look at what they have. The red F350 is mine. I think you'll like what you see and Garret will gladly help you with what ever you need. Diesel Driver