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 #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.