[Location of use / Use method] For stock engine and lightly tuned drivetrain
From stock engine to lightly tuned drivetrain. The center spring is responsible for forcing the pulley from a high ratio state to a low ratio state when re-accelerating or on a hill, etc. By reinforcing the center spring, it turns back to low gear quickly and enables sharp acceleration. However, if a too strong center spring is installed on a stock engine without power, the pulley side will not shift gears in low gear and only the RPM of the engine will increase, causing the maximum speed to drop, so please find the appropriate spring rate for your vehicle.
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