Exahust kit

[BigBlockChucky]

I have a 01 2500HD, 4wd, extended cap, long box, 8.1 & allison trans. Bought truck wrecked. Looking for a bolt on exhaust system from the cat back that will work with the long box. Most kits I have seen only show for the short box. Previous owner installed duals off cats. Makes it too loud for my taste. I don't like everybody in the neighborhgood know I am coming.
Any suggestions??

[1988 GMC 355]

I would say your best bet is to have a shop just put in a muffler of your choice and run it how you want.