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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
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.7 ★★★★★
Based on 1076 reviews
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Product Reviews
★★★★★ 5
Good product for a good price
Size: Large, Color: Pale Pink
Good quality, good fit. Length wise it slightly longer but overall a good product.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Best wallet ever!!
Color: Brown (Trifold)
Got this for my dad for Xmas. He’s the pickiest person ever with wallets. He’s had the same one since I was in elementary school. He likes the trifold heavy duty wallets so I thought I’d give this a try and he has been using it ever since! He really likes the quality and durability and trifold in this wallet. Super secure and the leather is nice. Lots of card capacity and isn’t too thick
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Heavy duty wallet.
Color: Black (Trifold)
Wow, this wallet is heavy duty thick leather with fantastic stitching. Will last a long time, very durable for a work wallet. The leather is smooth and fits well in the back pocket. A wallet for a man, not a boy.
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Reviewed in the United States on February 9, 2026
★★★★★ 5
Great wallet
Color: Black (Trifold)
He liked it
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Wallet
Color: Brown (Trifold)
Excellent material and very durable, a very necessary gift for my husband, he loved it
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Reviewed in the United States on May 2, 2026