Its dimensional.
Jim. Id love to just come over and use your bender but that is quite the drive. I appreciate it though. I might stop by a few places that were mentioned above.
We got a 1" tube die and bender.
Not being sure of what kind of tube you have though I would think one of the performance exhaust shops in the area could either mandrel or crush bend 1" steel easy since they do it with pipes up to 3". As for joining mild steel to SS I'd use TIG if it's available.