I'd have to agree with your observation on the bends. It seems to me that the pipe could be straighter and shorter by using a heat insulator near the radiator hose.
I also like the c/f idea.
This may all be rendered moot if the s/c ever gets warranty coverage approval by Isuzu, because then the pipe can be properly re-designed!
Wishing.......................waiting............. .................
P.S. W.S.G. can you include a smilie with one eyebrow up and straight lips for non-depressed questions? Sort of like a WTF (?) or Swarzenegger look.