I dunno about replacement intervals for gaskets, but you definitely want to replace any gasket with a new part.
Sergio, the downpipe "mouth" has a 5 bolt flange, and the gasket doesn't change no matter what downpipe you get. The one at the other end of the downpipe is probably a 3" 2-bolt gasket, but it could also be designed to work with the stock 2.5" donut gasket, which doesn't need to be replaced.
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FWD is the new AWD
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