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I've seen 142 in a stock car. It took FOREVER to get there so I haven't tried to repeat it.
My tach sits right around 3600 at 80mph IIRC. Most of the turbo kits are capable of giving you enough power to take it to the stock rev limiter in 6th, which would be somewhere in the 160-165 region, assuming I'm remembering that 3600rpm/80mph correctly.
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