SKU: 60691114135

Holley Sniper 2 EFI Self-Tuning Fuel Injection System Master Kit # HO550-510-3XK

Sale price$1527.75 Regular price$1697.50
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Description

Holley Sniper 2 EFI Self-Tuning Fuel Injection System Master Kit # HO550-510-3XKFuel Injection Systems, Sniper 2 EFI, Self Tuning, Throttle Body, Polished, 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

Fuel Injection Systems, Sniper 2 EFI, Self-Tuning, Throttle Body, Polished, 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:

Polished

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: 60691114135

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I’ve been using the Pull-Ups Boys' Skin Essentials Potty Training Pants for a few months now, and overall, they’ve been a great help during potty training. One of the best features is the velcro sides, which make on-the-go changes a breeze—especially when I need to leave my toddler’s shoes and pants on. It’s incredibly convenient and saves time. The training pants are also very soft and comfortable, which is important for a toddler with sensitive skin. However, I did have to size up as my toddler quickly grew out of them. (wears a size 2t but he fits the 4t pullups better) While these Pull-Ups have worked well for daytime use, I have experienced some issues with overnight leaking. This can be a bit of a hassle, so I’m still experimenting with different strategies to manage that. Overall, though, they’re a solid choice for potty training and are very comfortable for my toddler. Highly recommend for daytime use, though you might want to consider something else for overnight protection.
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Louisville, US
★★★★★ 5
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Size: 3T-4T, Unit Count: 112
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Reviewed in the United States on February 15, 2026
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Iryna
Lake Worth, US
★★★★★ 5
Excellent quality and adequate price
Size: Size 4, Unit Count: 120, Size: Size 4, Unit Count: 120
Got it — I’ll write you a strong, natural, insight-rich review I’ve been using these diapers consistently since my daughterwas born, and after several reorders, I feel confident sharing a detailed review for parents who are trying to decide. First, what really stands out is how lightweight yet absorbent they are. They don’t feel bulky when my baby is wearing them, which makes a noticeable difference in comfort—especially during longer stretches like naps or overnight use. Despite being light, the absorbency is reliable and holds up well throughout the day. One feature I truly appreciate is the quality of the inner filling. Unlike some other brands I’ve tried, the padding here does not become lumpy or uneven, even after extended wear. It stays evenly distributed, which not only improves comfort but also helps prevent leaks. Comfort overall is excellent. The material feels soft against the skin, and I haven’t noticed any irritation or redness. Another big plus for me is that these diapers are completely free of any strong odors or artificial scents. Some brands have a noticeable smell right out of the package, which I personally don’t like—but these are refreshingly neutral. Fit-wise, they stay in place well and don’t sag easily, even when full. That adds peace of mind, especially when we’re out or during overnight use. I’ve reordered these multiple times now, which says a lot. They’ve been consistently reliable, comfortable, and well-made. Based on my experience, I would definitely recommend them to other parents looking for a dependable everyday diaper. Overall, a solid choice that balances comfort, quality, and performance.
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