Not being an expert, I'll offer my advice anyway. I would think unless you are very good, a buzz box arc welder would be a difficult method. I'm sure I'd burn holes through the pipes! Gas welding would be my second choice - again, I think it's and art form that takes a lot of practice. It used to be the method of choice for exhaust work. Most muffler shops, at least those I've been to, use a wire feed MIG welder these days. It's what I used on my system. It doesn't take a huge amount of skill to get a decent weld, but practice on the same thickness material would still be advised. I used a 75/25 mix of CO2/Argon.
If you can line up a MIG welder that's what I'd do. And trust me, if I can weld with one anyone can weld with one! Good luck!
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