Most failures on stainless exhaust come from improper mounting of the exhaust. Since the stainless grows then shrinks a ton using multiple expansion couplers, and making sure the rest of the mounts can move on the car is paramount.
Very nicely put
I'm making mine all 304 SS ( headers to the tailpipe) don't want corrosion holes down the line among its other benefits.
That is my struggle, giving it room to expand while keeping it tight to the body.