If I am correct, you would want to use zinc plated bolts and nuts for use with an exhaust, because of their rust resistance. What kind of exhaust designated nuts and bolts have any of you all had good luck with and where did you get them from?

I have had pretty good luck with stainless nuts and bolts from lowes. even on my turbo to downpipe flanges, very hot.

use stainless with and make sure to use lock washers and antiseeze

lockwashers are key. ^^ good call