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I think it was around 60,000 miles, and just because we were tracking the car so much that we didn't want to take the chance of losing it at the track.
On removing it, however, it was clear that we were replacing it ahead of time--there was plenty of life left in it.
30k, started to slip under boost. I hate that, so I run CM stage 3 now. It has about 8K on it and about 3 dozen hard drag launches at the strip, still like new.