[flyin ryan]

I lightly sand down both the male & female flanges to take off any burrs or scratches for a good seal, then I use Kopr Kote (Anti-Seize) lightly on the flange & bolts. Works good. Doesn't act as a sealer of coarse, but helps the flanges find their mate to each other & of coarse long term helps for coming apart. I'm even a little surprised your putting exhaust on Michael...