How do you all weld exhaust?

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At my shop I have always used a mig welder to weld exhaust and it has worked perfectly fine for me.  I noticed all the shops around me use mig, even the place that specializes in exhaust.  Sometimes it aint real pretty but its quick, easy, and doesn't leak in my experience.  I would like to make nicer looking welds on some exhaust systems I do on performance exhaust but I'm not sure if I should even try to use my torch set or will I need to get a tig welder.  I feel like I can weld pretty good playing around with my torches.  Do you guys weld the exhaust or braze the exhaust with the torch?  I got some copper coated steel rod that I'm thinking of trying on exhaust.  I've known guys who use coat hangers but them are hard to find that aint plastic.  I will probably stick to mig on the stock exhaust because I hate filling the acetylene tanks.
Reply:I think sticking to mig is a good idea also for you. I tig myselfLast edited by motolife313; 03-04-2015 at 11:38 PM.
Reply:oxyacetylene torch is pretty useless here... mig it to save time, or tig it to make it pretty (or when you can't mig it).Welding/Fab Pics: www.UtahWeld.com
Reply:I don't weld exhausts too often, but the last car I built I used Mig/0.23 wire and it worked quite awesome. aluminumized pipe.Miller 211Hypertherm PM 451961 Lincoln Idealarc 250HTP 221  True Wisdom only comes from Pain.
Reply:Ok Ill probably just stick with the mig then.  I got a new millermatic 252 on the way so maybe ill be able to make them a little nicer with that.  Thanks for input fellas.
Reply:Going from an .030 or larger wire on exhaust down to an .025/.023 wire makes a considerable difference.  Allows you to stay in one spot longer without risk of blowing through, which will flatten the weld profiles out and let you work on keeping the beads straight.