SKU: 4396028248

Holley Sniper EFI Self-Tuning Kit Handheld EFI Monitor & Pump Black # HO550-511D

Sale price$1572.75 Regular price$1747.50
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Description

Holley Sniper EFI Self-Tuning Kit Handheld EFI Monitor & Pump Black # HO550-511DHolley Sniper EFI Self Tuning Kit Handheld EFI Monitor & Pump Black # HO550 511D Fuel Injection System, Sniper EFI, Self Tuning, Throttle Body, Black, 4150 Flange, 800 cfm, Fuel Pump, In Tank, Fuel Regulator, Tuner Unit, Kit Fuel Injection Style: Throttle body Fuel Injection System Type: Single 4 Barrel Throttle Body (4150 Flange) Maximum Horsepower with Gas: 650 Timing Control Compatible: Yes Power Adder Compatible: No ECM Included: Yes Self Tuning:

Holley Sniper EFI Self-Tuning Kit Handheld EFI Monitor & Pump Black # HO550-511D
Fuel Injection System, Sniper EFI, Self-Tuning, Throttle Body, Black, 4150 Flange, 800 cfm, Fuel Pump, In-Tank, Fuel Regulator, Tuner Unit, Kit
Fuel Injection Style:
Throttle body
Fuel Injection System Type:
Single 4-Barrel Throttle Body (4150 Flange)
Maximum Horsepower with Gas:
650
Timing Control Compatible:
Yes
Power Adder Compatible:
No
ECM Included:
Yes
Self Tuning:
Yes
User Tunable:
Yes
Fuel Pump Included:
Yes
Fuel Pump Flow Rating (lph):
340
EGR:
No
Transmission Controller Included:
No
Metering Style:
Speed density
Intake Manifold Included:
No
Multi-Port Fuel Rails Included:
No
Throttle Body Included:
Yes
Throttle Body Mounting Flange:
4-barrel square bore
Venturi Quantity:
4
Airflow Rate (cfm):
800 cfm
Throttle Body Material:
Cast aluminum
Throttle Body Finish:
Satin black
Injectors Included:
Yes
Injector Size (lbs/hr):
100 lbs./hr.
Calibration Module Included:
Yes
Wiring Harness Included:
Yes
Oxygen Sensor Included:
Yes
Fuel Pressure Regulator Included:
Yes
Distributor Included:
No
MAP Sensor Included:
Yes
IAT Sensor Included:
Yes
TPS Sensor Included:
Yes
IAC Motor Included:
Yes
Quantity:
Sold as a kit.
Holley Sniper EFI Returnless Self-Tuning Fuel Injection Systems
If you want to convert to Sniper EFI, but don't like the idea of mounting an external fuel pump, look to Holley Sniper EFI returnless self-tuning fuel injection systems as the solution. These drop-in kits make plumbing your Sniper EFI installation as hassle-free as possible. The Sniper EFI Master kits combine their self-learning throttle body with an easy-to-install, in-tank retrofit returnless module, 20 ft. of Earl's Vapor Guard fuel hose, and the required fittings. The included fuel system places a 340 lph fuel pump in the tankwhich can be easily accomplished with basic hand tools.Holley Sniper EFI Returnless Self-Tuning Fuel Injection systems include: Available finishes: black ceramic, classic gold, and shiny Throttle body-mounted ECU; no extra boxes to mount Supports up to 650 hp with four 100 lb.-hr. injectors Only four wiring connections required: battery +, battery -, switched ignition, and rpm Integrated ignition timing control and coil driver Simple calibration wizard and self-tuning ECUno laptop required Dual-pattern bolt-on carburetor replacement, designed to fit 4150 flange and spread bore manifolds (Spread Bore Sealing Platepart 9006recommended) No external fuel return line required High-resolution full color touch screen for initial setup, tuning, and gauge displays OEM-style TPS/IAC and fuel pressure regulatorfor years of dependable service Included clamp-on oxygen sensor kit ensures a leak-free oxygen sensor installation, with stainless steel T-bolt clamps and a stainless steel (weldable) oxygen sensor flange Genuine Bosch LSU 4.9 wideband oxygen sensor provides real-time fuel map learn Includes complete fuel system: Sniper EFI retrofit returnless fuel module; 20 ft. of 3/8 in. Vapor-Guard fuel hose; 5 stainless steel hose clamps; a post filter; and various Earl's fittings and capsSniper Returnless Retrofit Fuel Module details: Sniper retrofit fuel module installs in any fuel tank from 7 to 12 in. deep Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (preset to 58.5 psi) The low-profile design is only 1.275 in. thick above the tank mounting surface The innovative clamping system allows you to locate the module anywhere in the tank beside your existing sending unit The clamping system allows you to rotate the unit 360 degrees for easier clocking of the plumbing and wiring locations under your ride Diecast aluminum construction for corrosion resistance and long-lasting good looks 1/4 in. NPT ports for a wide variety of plumbing options
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 4396028248

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4.3 ★★★★★
Based on 26 reviews
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A
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Abby B
Dallas, US
★★★★★ 5
Surprisingly great for my wide feet and high instep!
Size: 10.5, Color: Velvet Tan/Gum 2
So thrilled I took a chance on these. Finding boots is impossible for me. I have wide feet, a super high instep, a bunion on one foot, and I wear a hard to find size (10.5). I ordered the 10.5 and 11 in these expecting I might need to size up for width (if I could even get them on). It was a struggle getting the 10.5s on the first time, and once I did they were somewhat uncomfortable on the top of my left foot. But I read that they would relax so decided to give it a go because I need waterproof boots for an upcoming trip and the 11s felt too long. After two days of light wear, they are already breaking in and I have no more discomfort. Getting them on is already easier and they are plenty wide enough and very comfortable to walk in. These are true to size. Super happy and worth a day of mild discomfort to break them in!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026
E
Verified Purchase
EE
Los Angeles, US
★★★★★ 5
Comfortable, sturdy, waterproof
Size: 9.5, Color: Black/Black
Loce, love, love these boots. Have walked ten miles with no foot pain around NYC. They go with everything and and are so comfortable. As they are waterproof/resistant, they get a little warm in high temps, but perfect three-season boots.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
K
Verified Purchase
Kate
Louisville, US
★★★★★ 5
Super cute, comfortable, practical, love that they are slip on
Size: 10.5, Color: Tobacco/Black
I have worn these 2-3 times already. The first day was a school/work day so I was on my feet 9 hours and the only issue I had was with the side of the boot rubbing against my ankle. I just make sure I wear socks high enough to cover my ankles or jeans that go into the boots now for long wear days. Absolutely love them! They keep my feet dry in this snow( we live in Michigan). I had been looking for a pair like this for awhile now and was getting super frustrated that I couldn't find my size in any that I liked. I saw that they had these available in a 10.5 and I wear 11. I looked at the Sorel website reviews (since the amazon ones weren't super helpful on sizing) and they said that the boots ran big so I took a chance on the 10.5 fitting me. They fit perfect. I have long narrow feet but I could see where they would be tight or uncomfortable on someone with wider feet. I've been trying to find a pair for my mom now since she has boot envy.
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Reviewed in the United States on January 27, 2026
N
Verified Purchase
Nicholle King
New York, US
★★★★★ 5
Worth it.
Size: 8.5, Color: Crushed Clay/Gum 2
Love all my Sorels. These were really cute, good color, comfortable, warm, fit well, good quality and sturdy. I would order again.
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Reviewed in the United States on March 26, 2026
J
Verified Purchase
jmb02129
San Leandro, US
★★★★★ 5
Fantastic Boots!
Size: 8.5, Color: Redwood/Gum 10
Completely satisfied with these boots. True to size, well made, comfortable from the get-go; not break in needed. Waterproof- really. The Red Suede has withstood a nasty winter season & still looks great. Good traction. I like the ankle height which looks good with long, mid length pants & leggings. I love the easy slip on/off aspect..made getting ready for dog walking easy. I 100%recommend!
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Reviewed in the United States on April 11, 2026

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