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Description
Holley 550-871K Holley Sniper EFI Stealth 4150 Master Kit - Black FinishOverview: 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 | Black |
| 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
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Product Reviews
★★★★★ 5
Excellent
Excellent reflections on the most important subject. This book provides and intermediate Christology. It brings the Biblical text and conciliar theology to help illuminate current discussions and debates on the person and work of Christ. Highly recommended.
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Reviewed in the United States on February 11, 2024
★★★★★ 5
Exactly what my sink needed!!
Color: Black, Color: Black
Okay, this thing turned out to be way more useful than I expected. It’s big enough to actually hold everything — sponge, scrub brush, even the soap dispenser — without looking cluttered or crammed together. Plus everything dries faster, so my sink area finally doesn’t look like a wet chaotic mess all the time. 😅
The quality is really solid too. Feels sturdy, doesn’t rust, and was super easy to install. It stays put and keeps water from collecting around the sink, which honestly makes cleanup so much easier.
Such a simple little product, but it really does make the kitchen look cleaner and more organized. Definitely recommend.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Worth the price !
Color: Black
This is a great way to put everything together. Everything on the counter looks organized and it’s a great wayto get all your sponges and dish soap and everything to look nice. I was pleased that it is well-made and sturdy. It’s very handy and I’m very happy with it. I’ve been using it for about a week. I have bought different products in the past which were OK but this one holds everything not just some. Do you highly recommend it it is worth the price !!
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Reviewed in the United States on June 1, 2026
★★★★★ 5
It’s sturdy, easy to assemble
Color: Black
I really like this sink organizer. It’s sturdy, easy to assemble, and keeps my sink area neat and clutter-free. It holds soap, brushes, and sponges perfectly, while draining water well and staying clean without rusting.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Space-Saving and very practical sink organizer
Color: Black, Color: Black
This sink caddy is a great addition to my kitchen- The 90-degree L-shaped design fits perfectly in the corner of the sink, making excellent use of space without cluttering the countertop. It easily holds sponges, brushes, and soap, keeping everything organized and within reach.
The metal construction feels sturdy and well-made, and it stays stable without sliding around. I also like that it allows items to dry quickly, which helps keep everything more hygienic.
Overall, it is a simple but very functional organizer that keeps the sink area neat and efficient. Highly recommended for anyone looking to save space and stay organized.
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Reviewed in the United States on April 19, 2026