With stainless having different properties than mild steel or galvanized dipped mild steel exhaust, it takes different types of mandrel dies to form the bends. The old corner custom muffler shops are disappearing, and the few that are around aren't upgrading their equipment. I checked Google, and the question has been out there since 2012 on the CJ2A forum, but no responses. I did come across a manufacture that may be able to take your pattern, and mandrel bend to your specifications. Or, you can purchase the radiuses, and fabricate your own. Columbia River Mandrel Bending;
One of my neighbor brought me some stainless cut offs from the local steam plant. They even cut 45's in them. I put them on an old 360 C.I. derby engine. They sounded rather good, and had good color to them after a night of running.
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