While you most certainly can weld dissimilar steels Phil is right the only way they work is when they are similar or have a dedicated filler/spool of wire mild on stainless will not last for two reasons one has a different expand contract rate to the other this is a perfect recipe for stress fracture especially on an exhaust ie hot cold hot cold the other fact is that it will rust along that seam even some stainless mig wires will rust as well, as the heat involved changes their properties, I would try to get grade 316 better still 316H or even better again would be 316Ti which contains a small amount of Titanium which helps with the weld boundry.
At minimum you want 316 for it to look and perform better
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