The oem crank can handle 9k. I would contact onpoint dyno. Sasha was using a 370z oem crank when revving to to 9k. Head studs like it was stated above. You might want to look into bryant racing billet cranks to higher revs, yes it will cost some change, but you're already dumping retards amounts of money into the car, and you're already talking about boosting it down the road.
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