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There is no such thing as "no more flutter" as long as the turbo is operational. The question is can you get your exhaust big and loud enough to mask the sound.
I think I am going to end up getting a 4'' downpipe , and fabbin up my own 5'' exhaust. The 18wheeler place I used to work at sells that flexable exhaust tubing , which can be bent in all sorts of ways, and I can also get a 5'' exhaust turn-down from them.
I saw a F-350 Dually with this type of setup once , but he had actuall 18wheeler stacks as side pipes.......