In the not to distant future I've got an exhaust to weld for a non-Subaru application. I've got a ton of raw materials in terms of pipes of different diameters, and a combination of stainless and mild steel.
I've got both an Oxy-Acetylene setup and a MIG welder. The oxy I'm mostly using to join sheet metal and MIG I'm using as general use.
I've read at least a couple of articles that say that you can MIG weld an exhaust but TIG is preferred. Why? I haven't tried TIG welding yet so I have no idea how different it is or what applications I'd use it for.
Also I assume I can't oxy-weld it because the flame that's joining one side would be blowing a hole in the other. That sound about right?