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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Morstead
Phoenix, US
★★★★★ 5
Comfortable & well-fitting, but some differences in stiffness between batches
Size: Medium, Color: Black/Deep Blue/Deep Grey/Heather Grey
I've basically been exclusively buying these since I've discovered them. Super-comfortable and maintain their shape for a long time, but I've noticed from buying it multiple times that sometimes the pouch area has stiffer texture and more support than other times (when it's loose & stretchy like the rest of it). I wish I could specify receiving the more-supported ones because they tend to produce less....how to say, knocking the boys around.
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Reviewed in the United States on March 22, 2026
E
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EclecticJay
Waukegan, US
★★★★★ 5
Comfort and softness
Size: 3X-Large, Color: Black/Navy/Dark Grey/Red
True to size; they are comfortable, good quality, and really soft.
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Reviewed in the United States on January 3, 2026
J
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James
West Palm Beach, US
★★★★★ 5
Look great, feel great
Size: Large, Color: Black
These feel great and fit well. With most briefs I tend to the trouble either keeping the front in or not having the back cover everything but these do both things and are very soft. They also look great, even on body types not in the promo picture. They are a great set of briefs and have held up so far and I got mine a little around a year ago and wear them often.
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Reviewed in the United States on September 26, 2025
G
Verified Purchase
garlic brad
Dallas, US
★★★★★ 4
Comfortable, but run big
Size: Small, Color: Red/Orange/Yellow/Blue
I'm a small guy and I purchased size small. The underwear are not bad. Great if you're a bigger guy or if you have a really big butt. If you're on the smaller side or skinnier though they'll fit a little loose. My butt is pretty big, but it doesn't fill out the back completely. Very comfortable though and the waist fits fine. Just a big backside. They don't ride up and so far they're durable. No fading in color and the material holds strong after many wears and washes.
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Reviewed in the United States on February 24, 2026
S
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shaik
Cuba, US
★★★★★ 5
Value. Fabric quality.
Size: Large, Color: Black/Navy/Dark Grey/Red
Better than I expected. Great fabric. Perfect fit. This is the most satisfying buy that I ever did. For this price!
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Reviewed in the United States on February 14, 2026

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