SKU: 61000550190

Holley 550-871K Holley Sniper EFI Stealth 4150 Master Kit - Black Finish

Sale price$877.48 Regular price$974.98
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Ships within 48 hours · Estimated delivery Aug 3 - Aug 8

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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:
  1. 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
SKU: 61000550190

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Jaclyn P.
New York, US
★★★★★ 5
I would buy this twice!
Style: Sport, Size: 12in
This Chuckit! Dog Ball Launcher 12M Sport is the perfect product for the dog park! It makes games of fetch so much easier and more fun — the long handle gives great reach, so I can launch balls super far without even bending over, and our dog goes absolutely wild chasing them. It’s comfortable to hold, works smoothly with 2.5" dog balls, and really saves your arm and back if you’re doing a lot of throwing. The design is sturdy and reliable, so we can play for longer without worrying about it snapping or wearing out. If you spend time at the dog park or love playing fetch, this launcher turns a regular game into something even better — our pup gets twice the exercise and we get to enjoy every minute of playtime!
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Reviewed in the United States on March 1, 2026
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Amanda Burns
Waukegan, US
★★★★★ 5
Caution can cause addiction
Style: Sport, Size: 12in
My dog has become addicted to tennis balls because of this! She sees the blue handle and she immediately loses her mind! I love it because I don't have to bend down as far to pick up the ball, which is amazing after 2 back surgeries.
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Reviewed in the United States on February 25, 2026
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Sandy
Louisville, US
★★★★★ 3
12 " too short, no direction.
Style: Sport, Size: 12in
I got the twelve inch handle. It is too short and does not flex enough to release ball in right direction. Its almost impossible to aim and doesn't sent the ball far enough.
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Reviewed in the United States on April 22, 2026
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Jeanine Manda
Omaha, US
★★★★★ 5
Tough and fun
Color: Black
My boy, who destroys everything, loves this! I even got one for a friend and her dog loves it too.
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Reviewed in the United States on May 18, 2026
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R McMillian
Cuba, US
★★★★★ 5
Good quality and the dogs love trying to get the ball thats inside the ball, lol
Color: Black
I have a great pyrenees and she loves this toy!
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Reviewed in the United States on May 20, 2026

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