SKU: 59114745016

Holley Sniper 2 EFI Self-Tuning Fuel Injection System Master Kit # HO550-511-3XK

Sale price$1552.50 Regular price$1725.00
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Description

Holley Sniper 2 EFI Self-Tuning Fuel Injection System Master Kit # HO550-511-3XKFuel Injection Systems, Sniper 2 EFI, Self Tuning, Throttle Body, Black, 4150 Flange, 800 cfm, Fuel Pump, External Fuel Regulator, 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: Yes ECM Included: Yes Self Tuning: Yes User Tunable: Yes Fuel Pump Included: Yes EGR: No Transmission Controller Included:

Fuel Injection Systems, Sniper 2 EFI, Self-Tuning, Throttle Body, Black, 4150 Flange, 800 cfm, Fuel Pump, External Fuel Regulator, 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:

Yes

ECM Included:

Yes

Self Tuning:

Yes

User Tunable:

Yes

Fuel Pump Included:

Yes

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 2 EFI Self-Tuning Fuel Injection Systems

Holley Sniper 2 EFI self-tuning fuel injection systems are perfect for street rods, muscle cars, off-road trucks, or nearly any carbureted vehicle. They can put an end to cold start issues, hesitations, vapor lock, and flooding. The systems are available in standard tuning kitsor the Master kit that includes an external fuel pump. Choose from a polished or satin black finish on the throttle body.

Additional product features:

* Dual pattern bolt on carburetor replacement, designed to fit 4150 flange and spread bore manifolds
* Throttle body mounted ECU no extra boxes to mount
* Supports up to 650 hp with four 100 lb.-hr. injectors
* Only 4 wiring connections required (battery +, battery -, switched ignition, and RPM)
* Integrated ignition timing control and coil driver
* High-resolution full-color touch screen for initial setup, tuning, and gauge displays
* Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own); NO laptop required
* Self-tuning ECU means you don't have to be a computer/tuning wiz to have EFI
* Available in base and Master kits (Master kits include complete fuel system, consisting of 20 ft. of 3/8 in. vapor guard fuel hose, 12-920 fuel pump, filters, necessary hardware, and bulkhead fitting to return fuel into the tank)
* The included Genuine Bosch LSU 4.9 wideband oxygen sensor provides real-time fuel map learn
* OEM-style TPS/IAC and fuel pressure regulator for 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.

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: 59114745016

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T.M.K.
Draper, US
★★★★★ 5
Ohana caregiver
Color: Black
Its sturdy/heavy and the suction cups on the bottom work well. Our family is able to pull the paper towel without pulling the whole holder with them. The arm that holds the paper towel works well and we can pull one towel at a time. We are very happy with this product.
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Reviewed in the United States on May 9, 2026
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Patti Hammond
Los Angeles, US
★★★★★ 5
Great paper towel holder
Color: Silver
It was simple to put together. It holds my biggest paper towel roll with no issues. No complaints. Glad I purchased it.
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Reviewed in the United States on May 1, 2026
J
Verified Purchase
J. Barry
Natrona Heights, US
★★★★★ 4
would be five stars, but it makes a weird clicking sound as you pull a sheet to dispense
Color: Silver
After researching tons of these, and actually owning some of them in the past, I landed on this brand. i’m hoping it stands the test of time. In times past, the arm broke from the other heavy duty paper towel holders I bought (I think I’m on my fourth one right now. It’s pretty sad.). This one seems pretty stable. I like the suction cups on the bottom, although sometimes it makes it difficult to move and clean around it because it really has a good grab on my granite countertop. The one thing that I’m not a fan of is a clicky kind of sound when you pull a sheet to tear off. It’s a little bit annoying and kinda loud. If there were superior paper towel holders without the clicking sound I most definitely would purchase, but the other ones seem to be junk. Crossing fingers this one works. I’ll just have to ignore that clicking sound. It’s just how that propeller-like mechanism works that the paper towel itself slides onto.
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Reviewed in the United States on January 4, 2026
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Verified Purchase
Amazon Customer
Belleville, US
★★★★★ 5
Quality of this 👌 product
Color: Silver
This is a great item. It works very well. Very happy with this purchase
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Reviewed in the United States on March 30, 2026
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Stella
Los Angeles, US
★★★★★ 5
Stays EXACTLY in place!
Color: Black, Color: Black
Buying a 2nd one for the bathroom! Stays EXACTLY in place but easily slides on any surface to where ever you want it!! NOT like traditional paper towel holder that fall over when you pull the sheets apart!!! Great value! Convenient! Stable! Easy to install!
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Reviewed in the United States on May 1, 2026

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