Race cars are usually designed for power with little regard to longevity, so they do fail sooner.
Racing our cars usually results in behavior that's different than spirited driving on the street. On the track, many of us miss shifts, grind gear boxes, over rev when down shifting, flat spot tires, and other insults that would not happen on the street.
Trust me if you are not getting arrested while driving your Porsche, you are not driving it hard enough to effect it's longevity.
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