i have a small exhaust leak about 3-5 inches after the downpipe.

my question(s) is/are:

-can i weld on the stock exhaust?
-is there some type of filler to use?
-do i gotta buy new exhaust? or can i cut out the bad portion of the pipe and weld/tac on new piece?

i got a 3" d/p from zzp and the rest of the exhaust is stock.

id rather do a diy job instead of paying for labor and a new exhaust pipe but im not sure on what all i can do to the stock exhaust.

i can post pics if needed. thanks.