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 Jul 13 - Jul 18

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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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Donna Burns
Dallas, US
★★★★★ 5
Quality and cuteness
Color: Brown
I loved this so much I must order one for my self it’s so darn cute. Thank you
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Reviewed in the United States on May 28, 2026
K
Verified Purchase
KDSpray95
Carnegie, US
★★★★★ 1
Scam
Color: Brown+Blue, Color: Brown+Blue
Zero stars! What a disgrace. I waited weeks due to the delivery date changing after I placed the order. Then the shipping went up and cost more than the toy. It lasted 5 mins after opening, and it's head fell off. It was not even sewn on. So much for indestructible!!! Then when I returned, they sent a auto comment asking if I would keep it and take a 50% refund. No freaking way!! I'm so irritated right now.
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Reviewed in the United States on May 7, 2026
N
Verified Purchase
Nancy
Dallas, US
★★★★★ 1
This is not even chew resistant!!
Color: Brown
If there was an option for ZERO stars that would be this. Within 5 minutes my little 11 pound Havanese had all the ears off, then out came the stuffing. He had the little dog, and a green duck. I had to take the duck away to sew it….then he still had studding everywhere…and that was the little dog. Throwing stuffing and pieces away….I should have put these right back in the bags they came in. In no way ate these even chew “resistant “!!!! Probably just look good onna shelf.👎👎
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Reviewed in the United States on April 10, 2026
S
Verified Purchase
Sassafras
Pawtucket, US
★★★★★ 3
Not quite "indestructible"
Color: Green+Brown
These toys are so cute! But, they are NOT for aggressive chewers! 15 minutes and they were ruined. But for kinder chewers...they are adorable.
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Reviewed in the United States on April 15, 2026
A
Verified Purchase
Amazon Customer
Waukegan, US
★★★★★ 2
Easily Destructed
Color: Green+Orange
My dog destroyed it within a couple of days. The “rope” turned into strings which is dangerous if eaten
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Reviewed in the United States on May 31, 2026

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