Fel pro intake manifold gaskets for any 99-04 GT. Get them on Rockauto. Its literally the exact manifold gasket that came with your car from the factory lol. Seeing as its the updated factory intake manifold too.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.