3 Port MAC Single Turbo SolenoidDescription Single turbo boost solenoid Use this plug and play low frequency MAC solenoid if retrofitting a single turbo kit that runs an external wastegate. Includes plug and play harness connector for no splicing! The 3 Port solenoid controls boost up to 2. 5x spring pressure while the 4 Port solenoid controls boost up to 6x spring pressure. With the 4 Port you can run a lighter wastegate spring, for example, 6psi, and provide a much wider range of
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