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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
4.9 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 3
Really wanted to like this soap
Size: 3.5 Ounce (Pack of 6)
I waited until I went through 5 of the 6 bars of soap in this pack. It was very well put together with each bar individually wrapped with a cellophane and a nice paper wrapper. The scent upon opening the box was pleasant. Sniffing each wrapped bar to get an idea of how they smelled left me a little skeptical. So here’s the pros and cons:
PROS
Small bars but they last a long time.
4 of the 6 are scrubbing bars, meaning they have exfoliating bits of walnut shells in them, which for me, blue collar worker, I really liked.
Packaging is nice.
CONS
THEY ALL SMELL THE SAME!
I don’t know why this is, but I can only attribute it to the packaging and them being so close together. Pretty disappointing.
The walnut bits accumulate in the bottom of the tub and need to be rinsed down the drain.
All in all, decent soap without any noticeable differences in smell. Good enough for one purchase, but I’ll be buying a different brand next time.
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Great product!
Size: 3.5 Ounce (Pack of 6)
Ive bought these twice. I've tried several mens soaps from cheapest to most expensive. This product is as described and is great! The price point is great compared to others. Smells great, works great, nice scrubbing properties you can actually feel! Lasts as long as any others. Ill continue to buy!
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Reviewed in the United States on September 5, 2025
★★★★★ 5
CLEAN SMOOTH
Size: 3.5 Ounce (Pack of 6)
Great awesome soap quick lather Smooth clean skin without the dryness and does not leave too much residue in shower like other soaps Only downfall is soap is a bit small and i use it very quickly
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Reviewed in the United States on April 13, 2026
★★★★★ 1
Do not buy.
Size: 3.5 Ounce (Pack of 6)
As in my headline, DO NOT BUY this soap. there are a few reasons why I say that and I will cover them all here, but first and foremost, I say that because this soap is MADE IN CHINA..... now just take a moment to think about this. It is a soap, very basic common ingredients here, and its still cheaper for this company to have this made all the way in China and then ship it over here to the US and sell it, rather than just making it here (like almost all other soap companies do) in the US.
It is TERRIBLE soap. it is made with the cheapest ingredients that you can find, and one of my other reasons for not liking it is because it smells like CHEMICALS. the scents do not smell like what they are labeled as. They have a very heavy chemical smell to them all, and then some very slight floral and other weird scents that I cant describe.
The tobacco scent has absolutely no "tobacco scent" to it at all and the same goes for the leather. the last reason why I say to not buy the soap is because its a complete rip off. We already know that it cost nearly nothing to make this, because they are outsourcing the manufacture of one of the most common substances there is (hand soap) overseas to China, but they still have the nerve to charge a premium price for VERY SMALL bars of soap. the bars are not even that big, they are small when compared to other soaps like this. do yourself a favor, pass this one by and go for a different listing. if you buy this one, you will only be purchasing regret...
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Reviewed in the United States on March 7, 2023
★★★★★ 5
This stuff smells great I definitely will be ordering more
Let me tell you I'm only two bars in and it smells like or each bar it had smells like wonderful Rich old school lotion I honestly am happy I found them on accident but I would be going back many times on purpose I hope they keep producing this good product Feel clean no residues no extra dry skin and the smells are strong and light at the same time can't wait to buy some more, gentle on the skin moisturizing and I like the price
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Reviewed in the United States on May 14, 2026