Anti-seize compound is available at any auto parts store. If you don't use it, eventually (many miles later) the exhaust bolts will pretty much weld/rust themselves into place and will be very difficult or impossible to remove without cutting them.
Also, the gaskets burn in to some degree, getting thinner and sticking to the flange metal as they get heated by the exhaust. In my experience, the type of gaskets the aftermarket companies are using (Berk, Stillen) can't really be re-used once they've burned in. By that I mean, if you go and loosen those flanges again, the gasket may not reseal when you tighten it back down, so you need to have a new set of gaskets on hand if you do that.
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