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Description
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.
Holley Boost Control Solenoid # HO557-201Boost 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. They're driven by a Pulse Width Modulated (PWM) output of the ECU. It is advised NOT to use the PWM+ outputs on a Holley HP ECU, but rather use the PWM- outputs. If you have a Holley Dominator ECU, use either the PWM- outputs or a PWM+ output on the J2B connector.
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4.9 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Strong but Effective—Great Results if You Don’t Overdo It (Your Skin Will Warn You 😅)
Size: 8.11 Fl Oz (Pack of 1)
I’ve been using this glycolic acid toner for a few weeks now, and I have to say—my skin and I are finally on better terms. I originally bought it to deal with uneven texture and those random little bumps that seem to show up uninvited, and it’s actually made a noticeable difference. Within the first week, my skin felt smoother, and after a few weeks, I started seeing improvements in tone and dark spots.
The quality is pretty impressive. It has a lightweight, watery texture that absorbs quickly and doesn’t feel heavy or sticky. There’s a slight tingling sensation at first, which can be a little surprising—but nothing too crazy. Think of it as your skin saying, “Okay, something is definitely happening here.”
That said, this stuff is strong. I made the mistake of using it too often at first and my skin basically said, “Absolutely not.” Lesson learned—use it a few times a week, not every day (unless you enjoy living dangerously). Also, sunscreen is non-negotiable unless you want to undo all your progress.
One thing I really like is the versatility—you can use it on other areas like underarms or back, which is a nice bonus. And when it comes to value for the money, it’s honestly great. The bottle is pretty big, and since you don’t need much per use, it lasts a long time.
Overall, I’d say this is a high-quality product that actually delivers results—as long as you respect it. Treat it right, and it’ll treat your skin right… ignore the instructions, and it will humble you real quick.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Game changer! can’t imagine being without it!
Size: 3.4 Fl Oz (Pack of 1)
I’m absolutely delighted with The Ordinary Glycolic Acid 7% Exfoliating Toner! 🌟🌟🌟🌟🌟
This toner has transformed my skincare routine and significantly brightened my complexion. The 7% glycolic acid effectively exfoliates my skin without causing irritation, and I’ve noticed a remarkable improvement in texture and radiance.
After just a few uses, my skin feels smoother and looks more even-toned. I love how refreshing it feels upon application, and it absorbs quickly, allowing me to layer my other skincare products without any hassle.
The packaging is practical and easy to use, giving just the right amount of product with each application. Plus, the price point is fantastic for such a high-quality product.
Overall, I highly recommend The Ordinary Glycolic Acid Toner for anyone looking to brighten their skin and achieve a healthy glow. It’s become a staple in my routine, and I can’t imagine being without it!
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Reviewed in the United States on May 7, 2026
★★★★★ 5
The Ordinary Glycolic Acid 7% Review – Effective Glow & Smooth Skin Treatment
Size: 3.4 Fl Oz (Pack of 1)
I really like The Ordinary Glycolic Acid 7% toner. It helps exfoliate the skin and makes it look smoother, brighter, and more even over time. After regular use, my skin feels softer and looks more refreshed.
It is also very affordable compared to many other skincare products, and a little goes a long way. The bottle lasts a long time, which makes it good value.
However, it can be a bit strong for sensitive skin, so it’s important to start slowly and not overuse it. Also, sunscreen is important because it can make your skin more sensitive to the sun.
Overall, it is a very effective exfoliating toner and a great addition to a skincare routine if used correctly.
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Reviewed in the United States on May 1, 2026
★★★★★ 5
Powerhouse
Size: 8.11 Fl Oz (Pack of 1)
The Ordinary Glycolic Acid has become one of my favorite skincare products. It makes my skin feel smoother, brighter, and much softer after consistent use. I’ve noticed improvement in dullness, rough texture, and even areas like my neck and scalp. A little goes a long way, and the bottle lasts forever for the price. I also love that it’s multi-use and can be used on more than just the face. You do have to be careful not to overuse it because it’s strong, but when used properly it gives amazing results. Such a great affordable skincare staple!
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Reviewed in the United States on May 14, 2026
★★★★★ 5
this is such a good product! i love it!!
Size: 8.11 Fl Oz (Pack of 1)
i love this toner so much!! it has helped with my skin tremendously. if you are on the fence about it, just get it! its good for sensitive skin as well. i used to have those unexplainable bumps on my forehead for over a year but now they're gone and they were gone within one week of using it, it is such a good product!! i use it once every day at night but i have also heard people use it once or twice a week. this toner is also really good for dark armpits, BO or face, back and chest acne. its fragrance-free and the bottle size is pretty big and will last awhile. Highly recommend, 10 out of 10!
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Reviewed in the United States on April 21, 2026