Stainless Subaru

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Grade/thickness of Stainless Steel tubing for custom-made radiator coolant return pipe?

My vehicle [Subaru-powered Vanagon] needs a custom-made radiator coolant return pipe. This pipe needs to be about 14" long, with a 90 degree elbow at each end.

What grade and thickness of stainless steel tubing sould I use for this? Would a muffler shop be able to do the bending for me? Thanks!
Oops! Yeah I forgot to specify the thickness: 1.5"

Here's an example of what I need:

http://www.vanperformance.com/images/IM000400.JPG

Actually, I don't need to make this entire pipe. If I were to cut the pipe into two pieces, just to the left of the upright fitting [don't need that fitting, just trying to specify the location], I would want the piece to the right.

You could use aluminum tubing if you wanted to. It doesn't have to be very thick. .060" thick tubing should be more than thick enough. If you can, find a fabrication shop to bend the tubing. Most muffler shops have benders that crimp the tubing as it's bent. A good fab shop will have a mandrel bender that doesn't hurt the tubing at all.