re: fleetfoot
Yup. Racetrack is really hard on tires.
Camber plates, increase roll stiffness. BMW's love giant front swaybars.
Get a second set of wheels for track tires. Go square, the car will be faster and you can rotate them. Get accustomed to swapping them inside-out half way through the tread.
I recommend Hankook RS4, affordable, they like heat, are fast, and wear very well. Breakaway is a little more abrupt than A052 or RE71, and the RS4 is slower than both. I generally get 10ish hours of track time out of a set on an e36. Perhaps 8h on a heavier e9x?
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Sometimes a bolt is just a bolt.
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