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Holley EFI

Holley EFI High Flow Dual Solenoid Boost Control Kit


Part # 557-201 Be the first to write a review
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Introducing the newest development from the Holley EFI engineering team. The Holley EFI High Flow Dual Port Boost Control Kit. This kit contains a set of pre-installed high flow solenoids, which feature a dual O-ring sealing design, preventing any boost leaks out of the manifold. A black anodized billet aluminum manifold, with built in mounting provisions. Two pre-terminated connectors for a quick installation, and extra pins for those of you wanting to cut the harnesses to custom lengths. Finally two 1/4" push-lock fittings to simplifying the installation process. The Holley EFI boost control proprietary solenoid design flows nearly 40% more than comparable designs and up to 90% more than conventional 3-port boost control solenoids.


  • Black Anodized Billet Dual Port Manifold
  • Two 1/4” NPT Push-Lock Fittings for easy plumbing and installation
  • Two Pre-Terminated connectors simply plug into the solenoids and pin into Holley EFI ECU connectors
  • The billet manifold contains built in mounting provisions, setup for ¼ hardware
  • Proprietary design to flows nearly 40% more than comparable designs and up to 90% more than conventional 3-port boost control solenoids

About Holley EFI

Holley is the new standard in EFI! Whether you're engine swapping your classic car or need to manage 4000 horsepower in your twin-turbocharged drag radial race car, Holley EFI has the solutions you need to get your project up and running better than ever!

Brand Holley EFI
Emission Code5
Inlet / Outlet Size1/4" NPT
Product TypeBoost Control Part
Part Number557-201

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

When selecting solenoid configuration in the Holley EFI software, use the Dual Holley drop down selection.

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