Well first off you obviously need a 19" rim. Second... it will be massive and probably will need to clearance things for it to fit. Third... well have fun at $400+ per tire, if you can even find that size in a street radial.
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 ****.