SKU: 11082194050

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

Sale price$742.48 Regular price$824.98
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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:
  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: 11082194050

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KylieSC
Port Orchard, US
★★★★★ 4
A great enrichment toy to keep your dog occupied
Style: Fox
Do you have a small furry gremlin disguised as a dog in your life that needs entertaining while you work? Get yourself one of these! PROS - it keeps a smart dog occupied for anywhere between 10-20 minutes - if keeps a less than smart dog occupied a lot longer - you can fit quite a lot of treats of different sizes in there - you can throw it in the washing machine when it gets too dirty - also doubles as a tug of war toy CONS - it gets dirty fast - if you have a heavy chewer they'll rip it up and render it useless pretty quickly - it squeaks (good for dog not for human) This is one of my girls favourite toys, even now that she's a bit older and doesn't need constant stimulation she still enjoys running around with it and digging the treats out.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 13, 2025
M
Verified Purchase
Myles Rutledge
New York, US
★★★★★ 5
Dog loved it.
Style: Frog
Dog loved it, squeaker lasted about 5 minutes, which is about normal for any toy I’ve given her.
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Reviewed in the United States on May 21, 2026
T
Verified Purchase
TexasLady
Boise, US
★★★★★ 3
Frustrating and Not Durable
Style: Turtle
My Foxhound /Beagle mix had this toy torn in several places within minutes. He loves his toys, but this one seemed to frustrate him and me. The small slits are too tight for anything but kibble. The large pouch is too deep for treats, and would send kibble flying as soon as he shook it. Anything larger would get stuck! The pouch tore at the seams as soon as my dog tried to pull out a Milkbone. Only small treats would fit in the slits, and he’d lose interest with them. The squeaker was useless due to the large size and hardness of the head. The weight and size of the head and the length of the toy might be a problem for smaller dogs. This toy was returned.
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Reviewed in the United States on February 11, 2026
C
Verified Purchase
CHxx
Chelsea, US
★★★★★ 5
GSP Approved!
Style: Frog
Our GSP loves this! It's only keeps her busy for a few minutes, but then she carries around for an hour. The pockets are a great size for training treats and the Velcro has held up well despite repeated daily use!
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Reviewed in the United States on May 9, 2026
P
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Patricia
Charlottesville, US
★★★★★ 5
Great toy!!
Style: Frog
Cute cute dog toy! Tug of war time is fun and this toy holds up great. The toy also rolls up with Velcro spots to hold it making it fun for throw and fetch!7
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Reviewed in the United States on March 16, 2026

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