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You won’t see any adverse effects in a few hundred miles. After a few thousand you might see some accelerated wear on the inside of the tires. The specs listed in the track prep guide are pretty conservative, at 2.0F/1.5R (1.25 Non 1LE) with 0.1 toe. I put 3000 miles on my M3 with 3.0/2.8 resulting in obvious wear to my rear tires.
I can’t really comment on the trans fluid for your car. There’s not a recommended frequency for it, and I’m just now getting ready for my first track day in the ZLE. I plan to do the engine, trans and diff after a few track days to see how they look. I used to do the trans in my M3 annually, but after adding an extra 100 HP I found it was cooking the fluid, and started changing it more frequently. My ZLE has coolers for all of them, but it’s also pumping a lot more power through them.
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