Lol you're welcome Tim! I enjoy bouncing ideas around and trying to help
excellent work on deducing the info down to what you need!
That does seem
ridiculously small, even for a 1.0!
If you do not mind ordering pipe, I found this site -
Order Stainless 316 Tube in Small Quantities at OnlineMetals.com Where you can get 8' of 5/8" OD, 0.495" ID 316/316L tubing for around $80 after shipping and a 10% discount. That would be more appropriately sized for what you need, but it would not be mandrel bent. You would have to find an exhaust shop to do it for you, and I doubt you want to do that.