Stainless steel exhaust Mig soldering – Recommended?

Hi, I bought a stainless steel exhaust and would like to exchange the tailpipe. Since I have no sweat experience myself, I was with an acquaintance and wanted to “press his eye” 😉 He meant if he welded it with normal welding wire rusts all the fun. (that was also known to me as a layman) What he could offer me would be Mig soldering; in this case the wire would be made of brass. However, he did not know whether this is suitable for exhausting. Can you help me further there n? Is the whole thing leaking? Does this last? Does it come at some point? After all, Son exhaust is exposed to thermal stress other than a body sheet. …I don’t want to mess up my stainless steel exhaust. I’m grateful for all the tips.