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Description
Holley 550-871 Holley Sniper EFI Stealth 4150 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. For a complete installation, Master Kits include a complete fuel system with an external fuel pressure regulator preset to 58.5psi, 20ft of 3/8" Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware, and bulkhead fitting to return fuel into the tank!
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, 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
4.0 ★★★★★
Based on 1245 reviews
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Product Reviews
★★★★★ 4
Surprising quality for such a cheap item
Size: 4X-Large Big Tall, Color: Navy White Diamond Geo
Surprisingly good fit. The material is a bit thin and if you're wearing it on a cold day, I would recommend an undershirt. The collars could use a good starching for a more modern look. As it stands with an open jacket, the large collar makes it look a little dated. If you have 20 dollars and need a shirt you could certainly do worse.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
Nice
Size: 3X-Large Big, Color: White
Good shirt for price
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Reviewed in the United States on April 24, 2026
★★★★★ 3
Good, but could be better!
Size: Medium, Color: Lavender White Windowpane, Size: Medium, Color: Lavender White Windowpane
+ 3 ⭐⭐⭐ I honestly didn’t expect much at this price it's a good value for money & only if you pay the very discounted price ~$7 or ~$9, The fabric is of good quality feels soft and comfortable right out of the package, with just enough stretch to move around easily during the day. It’s light, breathable, and doesn’t feel stiff like some cheaper dress shirts tend to do.
The wrinkle resistant feature actually works only on paper, wrinkle resistant is only a slab of steel or rubber, though after a good steam iron it keeps the shape for a while. After a quick wash and dry, it came out looking presentable without needing much ironing, which is a huge win for busy mornings. The regular fit M is true to size and gives a clean, relaxed look without feeling boxy or too tight. I wore it to work and later out for dinner, and it still looked sharp by the end of the day. Love the Lavender White Windowpane color it is subtle & stylish. It adds a little personality while still being professional. The stitching and buttons feel solid, and after washing, the shirt held its shape and color well.
- 2 ⭐⭐ Here is the big critic, I liked the shirt, but it came stained there is a big stain on a sleeve, & I am not sure if it will come off, this is the second on I ordered because the first one was also stained, it seems like some oil or rust ingrained into the fabric, I can understand the first shirt was "used like new", but the second one supposed to be new, yet it is stained, a lot of loose threads, weird seams and stains. As I said this shirt justifies itself only at the discounted price.
I did my best to show it in pictures, alas not the way I wanted, it is more visible in person.
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Reviewed in the United States on December 28, 2025
★★★★★ 1
disappointing... buyer beware
Size: XX-Large, Color: Lavender White Windowpane
careful there is no pocket? what kind of essential long sleeve shirt arrives without a pocket? I took to the cleaners to have pressed, and just got it back today. so I missed the return window. I am disappointed, and a bit frustrated, it's never been worn and will not be without a pocket....
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Great value
Size: XX-Large, Color: Navy White Diamond Geo
Nice shirt for the price. Needed a budget shirt to wear with a suit and this fit the bill. Fits well. Is a little thin, you can see through it if not wearing an undershirt.
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Reviewed in the United States on December 27, 2025