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We ordered new exhaust gaskets from Mr. Gasket, but we were so impressed with our old Flow Tech gaskets from Holley (part No. 99150AFLT) that we reused them for this installation. The Flow Tech gaskets feature multiple layers of dead-soft aluminum which crush to conform to the shape of the header flange and mounting surface. In the two years since we originally put them on, they have yet to leak and are still going strong.