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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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4.2 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 5
Well made
Size: XX-Large, Color: Dark Burgundy
Very nice golf shirt, well made, perfect size, no shrinkage (washed in cold water), the shirt moves with your body ( a good thing), the shirt is worth the money.
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Reviewed in the United States on April 11, 2026
★★★★★ 5
good value, runs slightly large
Size: Large, Color: Dark Burgundy
great shirt for the price, I find it runs slightly large
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Reviewed in the United States on May 21, 2026
★★★★★ 3
Good looks but cheap fabric
Size: Large, Color: Light Blue
The sizing is about right, but the fabric is really cheap, flimsy and rough. Disappointed and this is going back
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Nice!
Size: Medium, Color: Bright Blue
My husband loves these. He’s got black, navy, bright blue, burgundy, grey…. and I’m sure I may be missing some! They hold up nicely after repeated washings in cold water in the machine and I always hang to dry. For golf they are fabulous because they are non constricting and comfortable while playing in the hot Florida sun which he does on a daily basis. They run very true to size….he takes his usual medium and they fit perfectly. Highly recommend!
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Reviewed in the United States on February 21, 2026
★★★★★ 5
nice fit
I am thoroughly impressed with this Amazon Essentials white shirt. For the price, the quality is outstanding. The fabric feels soft, breathable, and has a good weight to it
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Reviewed in the United States on June 12, 2026