I just finished up frenching 54 Ford headlight rings on my 41 ford. I have a set of 2.5" Round LED turn signals I want to french underneath the headlights. I was thinking of using 2.5" exhaust pipes to make the turn signal ring. Anyone have any ideas?

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You can use muffler tube or metal conduit but make sure there is not to much weld bead slag on the inside of the pipe from the manufacture of the pipe because that can be difficult to smooth out if you are Frenching deep. Tim

Crummy pic, but I made my own round inserts from flat sheetmetal to get the correct ID for these 63 cadillac signals.

I did not use exhaust tube mainly because I did not have the right size.....plus what was already said about the weld seam.

These are tail lights but the process should be about the same. I used 2 1/4" exhaust tube. Here's a few shots. Complete fabrication detail is here in my journal. As Tim points out you'll have a weld to contend with. I ground mine down somewhat with a carbide burr and then made sure the weld was at the very top of each ring when they were tack welded in. You would have to have a very good eye to detect them in the finished product.