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Two things to look at when comparing the Michelin Pilot Sport 4S and Pilot Super Sports, including the BMW Star designation.
The ZR Rating vs R (Y-Speed) might be on the BMW Star Tires. This means the sidewall might be stiffer for the 186+ mpg Speed Rating. Along with this design change, you will see the mileage warranty will drop from 30k miles to 20k miles for the ZR tires, that is a -33% reduction. So the compound is much softer for better grip, but you will be replacing tires more often. For a daily driver ///M car you want that 30k mileage warranty, and less sticky tires. BMW Star really means upping the handling specs compared with other manufacturers sports cars, for Car and Driver and Motor Trend, even if the tires only last 15k-20k miles, screwing over consumers. So BMW Star might be a net negative vs the typical P4S or PSS. You want more grip, get wider tires +10-20mm.
Post 2021-2022 Michelin Tire prices exploded to $350-$425 each for performance cars like a ///M car. So you don't want poor milage warranty Max Summer Performance tires.
Cheers
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