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Description
Holley EFI Water and Methanol Injection Solenoid 600cc 400hp # HO557-103Holley EFI Water and Methanol Injection Solenoid 600cc 400hp # HO557 103 Solenoid, Water Methanol Injection Nozzle, Aluminum, Anodized, Includes Fittings, Wiring Harness, Pigtail,Each Solenoid Type: Water injection Solenoid Material: Aluminum Solenoid Finish: Black anodized Fittings Included: Yes Quantity: Sold individually. Notes: Includes wiring harness with pigtail connector and nozzle. Delivers 600cc of water methanol per minute. For applications
Holley EFI Water and Methanol Injection Solenoid 600cc 400hp # HO557-103Solenoid, Water/Methanol Injection Nozzle, Aluminum, Anodized, Includes Fittings, Wiring Harness, Pigtail,Each
Solenoid Type:Water injection
Solenoid Material:Aluminum
Solenoid Finish:Black anodized
Fittings Included:Yes
Quantity:Sold individually.
Notes:Includes wiring harness with pigtail connector and nozzle. Delivers 600cc of water/methanol per minute. For applications delivering up to 400 hp.
Holley EFI water and methanol injection solenoids, when used with their other water/meth injection components and a Holley HP or Dominator EFI system, take your forced induction ride to the next level of performance! These solenoids are run by an injector driver output and are compatible with a water/methanol mix of up to 50 percent methanol
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4.7 ★★★★★
Based on 212 reviews
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Product Reviews
★★★★★ 5
MUST BUY Item for Breastfeeding Moms
Size: Standard (18-Inch), Color: Dark Grey
MUST GET item for breastfeeding moms. It is a soft pillow with a removable washable cover. The material is like a suede, which can make it hot to lean on if you typically feel hot when breastfeeding or sleeping. It allows you to sit up straight while in bed with great support.
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Reviewed in the United States on May 1, 2026
★★★★★ 5
It's perfect support.
Size: Extra Back Support (21-Inch), Color: Dark Grey
The best way to describe the super comfy reading pillow is super comfy. I use it to sit up while watching something soothing to my mind on tv and due to its comfyness and softness, it's perfectly just right for my back. The funny thing is within a few minutes I'm knocked out sleep, which is a good thing. It's soft but firm lumbar area and arms feels oh so comfortable. It gives the best sleep quality and less toss and turning. I highly recommend.
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Reviewed in the United States on May 7, 2026
★★★★★ 4
Great Size and Comfort
Size: Extra Back Support (21-Inch), Color: Dark Grey
2 months after buying a different reading pillow I felt it was time to buy a different one based on the comfort and support. I found this one listed for a good price. After carefully looking through the listing, I bought the 21" size. On my first night of usage, I was already impressed with the comfort and support vs the reading pillow I had bought 2 months prior. I like how this one has nice support for my neck and head as I'm relaxing on my bed with my laptop and phone. The texture of the filling gives it a very nice combination of cushioning and firmness. The horizontal feature line in the center of the pillow is a nice feature for back and neck support thanks to it giving the pillow some flexibility. As for the arms, their length, width, height, and cushioning are very good for resting my arm while I'm using the wireless mouse with my laptop.
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Book Reading Wife Approved
Size: Standard (18-Inch), Color: Sage Green
I purchased this for my wife who reads quite a bit and she absolutely loves it. She said it feels soft, is the right size for her, and makes book reading more comfortable for her. I call it a win.
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Reviewed in the United States on April 23, 2026
★★★★★ 3
Not good quality
Size: Standard (18-Inch), Color: Dark Grey
Comfy, however it’s getting flat an only had it a week
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Reviewed in the United States on April 27, 2026