if its just to make a stainless exhaust then just chuck a roll of stainless wire in the mig. as long as you are using some kind of argon mix you will be ok. the welds will be a bit brownish but they will go that colour from the exhaust heat anyway.
you can tig ali just fine without a pedal i put the welder on 2t and set the slope out to 4-5seconds. if the pool starts getting too hot then i just take my finger off and it slopes off the power. i have tried to use pulse but i dont get on with it too well. thebest thing you can have on a tig for ali welding is square wave control as it allows you to increase decrease the size of the weld pool vs pool depth
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