If its 16ga stainless, you wont need to back purge. Just make sure you use .045" filler and keep the machine at 55 amps. Its all about the heat in the weld. Use 347 stailess filler. You can accomplish this without crystallizing the back side. I do back purge collectors because there is so much heat in that one area.I also use stainless filler for ALL my mild steel headers and exhaust. 309L filler.
Hope this helps.
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