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Yes, you want 1/8". I used stainless, and put a layer of high temperature, UV rated foam under the edges. All tied on with some stainless lock wire.
FWIW:
If you insulate the pipe, it helps keep carbon and gunk from depositing in the pipe, but doesn't eliminate it entirely. The corrugating in the flex pipe are just naturally good at having nooks and crannies that deposits get into. For long term use, I would try to use smooth pipe as much as...
Definitely get some rubber on the pipe strapping. I would stick with at least three or four feet of flex before moving to solid pipe. Getting absorber is easiest to do at the beam, and you probably want it pretty stretchy. You could even pick up some exhaust hangers.;)
If it were me, I might...