The exhaust is in good shape up to the cat,it's getting bad after the cat. So I'll look at replacing it after the cat, it's a banks muffler and end pipe, which when my dad bought the powerpack kit,it should of been stainless steel, but it is not, and after 13 years its corroding /rusting to the point it getting holes in it.Your exhaust looks to be in good shape, I'd leave it alone. If you live in an area where you have to do emissions testing you'll need that cat.