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Description
Holley 550-870K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master KitOverview: The Sniper Stealth 4150 EFI system from Holley features 4, 100LB HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of fuel map self learning and ignition timing control, improving idle stability, drivability, and wide open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM
Overview:
The Sniper Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications. Part # 34-42 is required for a bolt-in installation.
Features:
- Bolt on 4150 Flange Carburetor Replacement
- Throttle body mounted ECU - no extra boxes to mount
- Supports up to 650hp with Four 100 Lb/Hr Injectors!
- All of the wiring exits below the rear fuel injector cover, for a completely stealth installation.
- Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor.
- Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions.
- Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
- External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886.
- Integrated ignition timing control
- High Resolution Full Color Touchscreen 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!
- 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 for 2.25" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
- Available in 3 finishes: Shiny, Black and coming soon, Gold
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley Sniper EFI |
|---|---|
| CFM | 870 |
| Emission Code | 3 |
| Finish | Shiny |
| Flange Style | 4150 |
| Fuel Pressure | 58.5 PSI |
| Height | 3.28" |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 3/4-16 Female O-Ring (AN 8) |
| MAP Sensor | 2Bar |
| Max Horsepower Rating | 650 Naturally Aspirated |
| Model | 4150 EFI Conversion Throttle Body |
| Product Type | Sniper Stealth EFI |
| Transmission | 700R4/200R4 |
| Transmission | Ford C4/C6 |
| Transmission | TH350 |
| Warning | California Proposition 65 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.1 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Great for Pet Diapers Too!
Size: Size 1, Unit Count: 128
I have purchased these diapers several times for our special needs Cat. After purchasing one set of Pet diapers that cost a ridiculous amount of money for on,y 20 diapers and pay 25.00, I did what every other pet owner of dogs and cats do. Buy human diapers.
Just for reference the size, small diapers in the pet version equals a size 1 in the human diapers
The only thing you do is cut an upward slit on the back of the diaper that does not have the tape side. Place the slit just below the middle back part of diaper. I cut an inch or so slit. You don’t want the slit to be too big because you don’t want anything coming out of that part ha ha . You’re just using the slit to put the tail through. That’s it
Works like a charm.
Instead of paying $25 for 20 diapers in the pet version we pay $24-$28 for the Huggies version for 128 diapers.
Big difference!
I do not understand why all of the pet version supplements and other products are so much more expensive than the human version of the same exact product.
I don’t understand why the pet companies charge so much but customers will go to other sources to get just as good of a product at a reasonable price.
Thanks again Amazon and Huggies for providing a great product for our special needs cat!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
★★★★★ 4
Work 👍 great
Size: Size 1, Unit Count: 128
Diapers work 👌 perfect. I received them a day late & needed them for a baby shower. Amazon Prime stated that I would receive them the next day, Diapers arrived in 2 days. Therefore i went empty handed to the baby shower. Be warned Amazon Prime does NOT always deliver as stated.
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Reviewed in the United States on April 19, 2026
★★★★★ 5
Softest diaper ever.
Size: Size 1, Unit Count: 44
I’ve tried almost every brand on the market. I finally settled on these, and they are worth every penny.
Here’s why they stand out:
Absorbency: These are incredible for overnight. No leaks no late night changes
Material & Feel: They are incredibly soft—almost like cloth. If your baby has sensitive skin or is prone to redness, the breathable material makes a huge difference.
Fit: The leg cuffs are stretchy but secure. They dont leave that deep red marks that cheaper diapers do.
Wetness Indicator: The line is clear and easy to see, even through a onesie.
I bought a size 1 for my 9lb baby and it fits perfectly.
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Reviewed in the United States on March 3, 2026
★★★★★ 5
Best diaper
Size: Size 5, Unit Count: 84
The only diaper band we ever buy. We’ve never had any blowouts because of it. It’s easy to use and hold up a lot. It’s really soft and doesn’t give any rashes. The material is great. Doesn’t really stop odor not that I expected it.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
works great
Size: 60 Count (Pack of 1)
helped with sleep
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
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