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Description
Holley Boost Control Solenoids 557-201SOLENOID, BOOST CONTROL 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
SOLENOID, BOOST CONTROL
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.
Features:
- 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
Specs
| Brand | Holley EFI |
|---|---|
| Color | Black |
| Emission Code | 5 |
| Inlet / Outlet Size | 1/4" NPT |
| Material | Billet |
| Product Type | Boost Control Part |
| Part Number | 557-201 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 4
sizing
Size: 3X-Large, Color: Chocolate
Good quality, warm, sizing was dificult. I normally wear a size 12 shoe so I ordered an x-large but it was way too small. they shipped a size 11. Amazon was great with their free returns. I now ordered a xxx-large and they fit perfectly. x-large=11 and xxx-large=13
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Reviewed in the United States on January 3, 2013
★★★★★ 5
Good deal
Size: 12, Color: Tan
True fit, slip resistant bottoms and comfortable.
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Reviewed in the United States on October 11, 2025
★★★★★ 3
Slippers are nice But
Size: 11, Color: Chocolate
Slipper are warm and soft. The problem is the soles leave marks on the
floor. Washed the soles, still marks everywhere on hardwood floors.
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Reviewed in the United States on October 26, 2023
★★★★★ 5
Very comfortable
Size: 3X-Large, Color: Chocolate
Ahhhh! I think I found my slippers! They are wide enough, long enough, sturdy enough and comfortable. I might even buy a second pair to have handy.
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Reviewed in the United States on February 6, 2024
★★★★★ 5
Great toy
One of the best dog toys ever! Well made & sturdy enough to withstand hrs of play & tug between my Lab & my Westie.
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Reviewed in the United States on May 6, 2026