This article suggests this Ken Miles driven Shelby GT350R may become the world's most expensive Mustang.
https://www.thedrive.com/news/32564...IUX2F_iBYoGfKwNMt6RI0SGb3jSIjy-kB644paE9QtKIY
But my feeling is that it may fall short of the Bullit Mustang. Because Steve McQueen > Ken Miles in terms of star power and collectible status. (Personally, I'd rather have the Shelby.)