Unfortunately I don't know if you will get an answer on this topic. I would be curious to know as well but there just aren't enough high mileage 370z's out there that have had enough time to go through a stock clutch and an aftermarket one. Most people that have aftermarket clutches are boosted or race a lot and there is no apples to apples comparison. Likely most of those that have switched to aftermarket setups did so before the stock clutch went out. If your driving style is the same you should get comparable life from aftermarket.
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