Holley Boost Control Solenoid # HO557-201Holley Boost Control Solenoid # HO557 201 Boost Control Solenoids, Dual Solenoid Style, Electronic, Kit Boost Controller Type: Electronic Boost Controller Style: Dual solenoid Adjustable: No Wastegate Type: Electrical Quantity: Sold as a kit. Holley Boost Control Solenoids Holley boost control solenoids are designed for optimal performance when using the boost control function of Holley EFI. Some setups require two solenoids and some require one.
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