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If you want to easily adjust your boost level anywhere between 12 and 22 psi (depending on your crank dampener diameter), VMP offers an Interchangeable pulley system with 3-, 2.75-, and 2.5-inch pulleys. The VMP TVS features a specially turned-down snout to accept this system. You can't just use it on any TVS. If stock-look is your style, those pulleys are available in 2.59- and 2.5-inch diameters.