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- USA
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Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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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
4.1 ★★★★★
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Product Reviews
★★★★★ 5
Item as described
Style: PS5 Disc, Configuration: Console only
Exactly as described no issues
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Fan to prevent overheating
Style: PS5 Disc, Configuration: Console only
Nice, easy to install lights are a bit bright at night but you can turn it off
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Excellent Purchase, Highly Recommended
Style: PS5 Disc, Configuration: Console only, Style: PS5 Disc, Configuration: Console only
⭐⭐⭐⭐⭐
Excellent purchase! My PS5 arrived on time, brand new, factory sealed, and in perfect condition. Everything works flawlessly, and the packaging was great. Amazon delivered exactly as promised. Highly recommended!
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Fantastic!
Style: PS5 Disc, Configuration: Console only
I had a PS4 for years and thought, "Why do I need a PS5?"
Then Death Stranding: On The Beach was released.
Great games on this console!
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Reviewed in the United States on June 6, 2026
★★★★★ 5
If you're here, just get it, especially the disc version. You will not regret it.
Style: PS5 Disc, Configuration: Console only
This PlayStation 5 console is objectively one of the best purchases I have ever made. As we get older, we forget to keep having fun and experiencing life and everything that it has to offer. Coming from a Wii, the transition has been nothing short of astounding. The speed and responsiveness are unbelievable; it's like stepping into a whole new world of gaming and entertainment. Pairing streaming apps is an effortless process, and the visual quality of movies and TV shows has been elevated to a whole new level of stunning clarity. The ethernet port provides a rock-solid connection, eliminating any lag or interruptions, which is a huge plus for online gaming.
The numerous USB ports offer so much flexibility, allowing me to connect my noise-canceling headphones directly to the system, which is incredibly convenient. However, be warned, while it advertises 1TB of storage, you're realistically looking at around 830GB. Modern games are surprisingly data-hungry, and I already feel the pinch, with only about 100-150GB remaining. I would highly recommend opting for the 2TB model from the get-though, as the 1TB will fill up quickly. Games like Ratchet & Clank and Sackboy are incredibly fun and engaging, and I'm excited to dive into the Kingdom Hearts series soon.
Call of Duty: Black Ops 6 has been a blast in both multiplayer and the zombie modes, showcasing the console's power and performance. Also, seriously consider the disc version. I initially thought 4K was 4K, no matter the source, but I was completely wrong. The difference between streaming 4K and watching a 4K disc is night and day; the picture is crisp, the sound is rich, and the overall viewing experience is simply immersive. Apparently, streaming 4K is compressed, which I had no idea about.
For movie and TV enthusiasts, this is an investment that pays off handsomely. Imagine experiencing iconic films like "The Dark Knight," "Interstellar," or "Inception" with this level of visual and audio quality. Even shows like "Arcane" and the Spider-Verse movies would look absolutely breathtaking. I now understand why physical media still has a place, especially for my favorite movies and TV shows that I'll rewatch countless times. The ability to watch these titles in pristine 4K, regardless of internet connectivity, is a huge bonus, especially for families.
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Reviewed in the United States on April 2, 2026
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