2010 Castrol Syntec Top Car Challenge Buildup Part 3 2007 Ford Shelby GT500
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Here's a look at the difference in pulley size. The Lysholm 3.3 is set up with a 4.0-inch wheel from the factory (left). The new 3.25-inch pulley spins faster and increases max-boost by 5.6 psi (from 16 psi to 21.6 psi). View Related Article
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