I recently inquired about lower cost tires suitable for a 911 from a very knowledgeable and up to date source. In the old days, we used Yokohama ES 100s(?) for street duty and occasional track days, Michelins or Pirellis get expensive in a hurry when you are burning through them fast.
The answer was a Firestone tire that is actually a Bridgestone, apparently they have merged. Can’t remember the model but it’s fantastic and very affordable…this coming from one of the best Porsche pilots around.