I found a great/cheap source of exhaust bends,and  have ordered from.
Dawley Manufacturing
140 Industrial Drive
Burlington,WI. 53105
1-800-338-5420

Example
tubing bend- 2"dia x .049 thick 90 degree bend/w2" radius, $21.86. I think that these are probably the best prices I've seen so far.
Brian Trubee
RV-4/ working on the exhaust obviously

 
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