Mazda b220 exhust question

my friend gave me this 91 b2200. and it needs a exhust bad. it smokes like a teen at the dave mathews band concert. i am trying o get it legal in atlanta so how much does a new exhust cost exstamating/ i am notlookng for antyhing jus the cheapest way to get it legal. i think i will need everything like new piping but not all the big things like converters.