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When adding a set of headers, be sure to use premium quality 1999-04 Mustang header gaskets. Brothers Performance has a wide variety of top quality Mustang header gaskets that will give you the best seal and prevent blow-outs. Don’t waste your time with cheap 1999-04 Mustang header gaskets that will dry, crack and blow out. Install premium exhaust header gaskets the first time. It’s well worth it and you’ll be glad you did.