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This is just anecdotal and no data, but my rear axle seals used to leak with the stock brakes and stopped when I went to the GT500 setup. Cause and effect, I don't really know. The old seals might have just been worn out plus it should be noted I was new to track driving and using stability control a lot more back then. I don't have a catch-can but run the "turkey baster" on the top of the diff/pumpkin and sealed the vent on the axle tube. Dust shields removed. I use GLOC 12/8 front-rear or similar.
I remember being concerned about brake bias and the extra unsprung weight of the bigger rotors but I didn't notice any big differences. Mostly the car drove and stopped as before except my axle seals stopped leaking. Good luck.
I remember being concerned about brake bias and the extra unsprung weight of the bigger rotors but I didn't notice any big differences. Mostly the car drove and stopped as before except my axle seals stopped leaking. Good luck.