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Originally Posted by slubu

Thanks for the explanation, makes sense now. My question then becomes in order to increase at peak, does it reduce elsewhere or just keep it constant. In other words would it go from 300 to 250 lbft torque at 2000 rpms for example, so that it can go from 300 to 350 lbft torque at 4500 rpms?

Definitely not. That is all in the tune.