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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
4.7 ★★★★★
Based on 107 reviews
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Product Reviews
★★★★★ 4
Not for heavy chewers!
Theme: Animals, Size: Medium
Didn't hold up well - but realized I didn't read that it was for "light chewers." Otherwise, cute design.
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Reviewed in the United States on January 28, 2026
★★★★★ 5
Good for Chewers
Theme: Football, Size: Large
Dogs love it, they been chewing on it and it's like new. Also I put treats inside and they really like that. I have a small pit mix and a puppy shepherd husky mutt. They play tug of war with it and it's holding up really good.
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Reviewed in the United States on April 4, 2026
★★★★★ 5
Great inside toy
Theme: Football, Size: Large
Our Rottie loves these! I wanted something like the Jolly Ball but that is soft for inside the house. She's had a lot of fun with this, picking it up, tossing it, playing soccer, etc.
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Reviewed in the United States on May 15, 2026
★★★★★ 5
A BIG hit with my BIG dog!
Theme: Football, Size: Large
My Great Dane/Boxer mix LOVES this toy. She is over 100 lbs and very strong. She got a hold of my son's real football last year and after she made the initial holes and deflated it we just let her have it. She completely ripped it to shreds in about 7 months but had such a blast tossing it around and galloping around the yard with it, I knew I had to replace it with something of the same shape but hopefully more durable. This is it! She really adores this. We play catch and tug with it and it seems like it's going to last a really long time. The rubber is flexible but strong. I'll try to get a picture of her with it and load it. I highly recommend this toy. We ordered the Large size, by the way. :-)
2-6-2015 - Update: I am just now ordering a new one. For nearly 4 years, the old one has been kept outside in the rain, sun, snow, and ice. She still loves to grab it, shake it, throw it up in the air and play tug with whenever she's outside. The rubber is just now starting to crack so it's time for a new one.
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Reviewed in the United States on May 2, 2011
★★★★★ 4
Holding up very well, favorite
Theme: Football, Size: Large, Theme: Football, Size: Large
A few weeks ago I ordered three dog toys for my dogs. I have a German shepherd, Lab mix and a medium mix. The latter boy is the biggest destroyer in our family, he chewed pieces of a black Kong.
I did not really have high hopes for this football shaped toy with holes, but it is holding up beyond my expectations. You can see some teeth marks, but they are not chewing it up (yet?). They love to play tug with this, kick it around by themselves, or lie down with it and chew on it. I like it because it is a soft rubber and doesn't make so much noise when they throw it around on my hard flooring. For the price, they are definitely getting a whole lot of fun out of it.
Edit: Now, more than a month later, my dog managed to get a small piece off after a heavy chew session. After that first piece apparently it is easy to get more off, and he wants to swallow it so the ball is in the trash.
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Reviewed in the United States on September 29, 2021
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