Exhaust question?

I need to purchase a complete exhaust system from my 72 340 duster, i have hooker street comp headers. So I will need collectors to the repo chrome tips.
I have seen the full mandrel bent summit kit on ebay for $220 any good?
If anyone has some recent experience or similar, please let me in on a few tips? before i buy something. I'm thinking 2 to 2.5 inch in diameter.
Stainless or regular steel pipes?

Thanks