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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
4.5 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
10/10 sunscreen spray
I have combination skin that can get oily throughout the day, and I was excited to try the Naked Sundays SPF 50 Golden Glow Shimmer Setting Spray because I loved the idea of having sunscreen and a setting spray in one product.
The first thing I noticed was the packaging. The ombre gold to purple container looked so luxurious and intentional. The spray mist was fine and even, making it perfect to apply over my makeup with a smooth finish.
I love the scent. It smells fruity and delicious, which is such a refreshing change from the typical sunscreen smell that many other sunscreen sprays have.
Overall I loved this spray and it exceeded my expectations. It kept my makeup looking fresh all day long and gave my skin a beautiful, glowing finish. I would definitely recommend and I will 100% be purchasing it again!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 5
Easy Spray Sunscreen with No Greasy Hands & No Harsh Smell
Really impressed with this sunscreen. The spray nozzle makes it incredibly easy to apply without getting my hands greasy, which is a huge plus. It feels lightweight on the skin and doesn’t leave a sticky or heavy residue.
One thing I loved is that it doesn’t have that typical strong sunscreen smell, it’s much more subtle and pleasant. I’ve also worn it during workouts, and it didn’t run into my eyes or cause any stinging when I was sweating, which is rare for me.
It layers well over makeup and gives a nice, subtle glow without looking greasy. Overall, it’s convenient, mess-free, and something I’ll definitely keep using for easy SPF reapplication throughout the day.
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Reviewed in the United States on April 29, 2026
★★★★★ 1
Nozzle doesn’t work on a $30 sunscreen!!
I’d give this zero stars if I could. While I imagine the glow is amazing, I wouldn’t know because the spray nozzle on this doesn’t work. Not a single spray. I’m assuming it’s clogged with glitter and I’ve tried everything unclog it but for $30, I shouldn’t need to decant or switch this into another bottle. I will end up doing that, so I can hopefully use it, but my complaint remains. It is also not eligible for returns or replacements. Cute but useless packaging.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
My Favorite SPF Setting Spray
The Naked Sundays SPF 50 Golden Glow Shimmer Setting Spray gives the prettiest glowy finish while making SPF reapplication so easy. It feels lightweight, doesn’t mess up my makeup, and adds the perfect touch of radiance without looking too glittery. Definitely a staple in my routine!
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Nice product
Has a nice smell and leaves a glow. Be careful of too many sprays as scent builds too. Glow is subtle and does not have a glitter look. I like it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
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