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I put about 40 supercharged track days on my original bearings before I changed them. I would change the oil after no more than every 4 days and never launched the car from a stop. Only reason I changed them was the car was at the shop for belt replacement and other minor stuff so I saved a little on labor. However, they came out looking pretty darn good so there was really no need to replace them (other than peace of mind).
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