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an aftermarket exhaust does not come with the up-pipe you are asking about. the 6.0 did have a problem with the flex pipe leaking, but i am pretty sure there is an updated part. mine was leaking on the drivers side uppipe.
as far as the exhaust goes, you can go 4 or 5" if you want. personnaly, if i was to make over 550hp, i might think of getting a 5" but i bought a mbrp 4" and that is plenty enough for most people. get a little mirror to look back there to find the leak. mine also spewed a little soot against the firewall that helped me spot it.
as for the flutter, does it happen when you tramp on it then let off quickly? every 6.0 does that. totally normal. it is the residual boost coming back through the air filter from not being needed when you let off.
you will not do any harm to the motor if you go bigger on the exhaust. you will do it good by opening it up. it will breathe easier.
2003 F-350 6.0
HOMEMADE EGR DELETE, MBRP, QUADZILLA GAUGES, ARP'S, 4.5" ICON LIFT,TUNED BY INNOVATIVE, DJ'S, AND CALE.