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Reducing the upper pulley diameter increases the speed at which the supercharger spins, which results in more boost. Torq uses a 2.55-inch upper pulley, along with a solid LS9 isolator coupler, to increase the supercharger's speed by almost 20 percent, which resulted in a 3.6-psi gain on our test ZL1, taking boost from 9.9 to 13.5 psi. View Related Article
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