SKU: 11561083243

Holley 550-872 Sniper Stealth 4150 Self-Tuning Fuel Injection System 4150 Flange

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Description

Holley 550-872 Sniper Stealth 4150 Self-Tuning Fuel Injection System 4150 FlangeOverview: 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 Super 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 8 injector variation is capable of supporting up to 1250 HP on forced

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 Super 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 8 injector variation is capable of supporting up to 1250 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of complete ignition timing control, fuel self-learning, 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? Master Kits include 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 fit's a wide range of factory intake manifolds
  • Throttle body mounted ECU - no extra boxes to mount
  • Supports up to 650HP with four 100lb/hr injectors or 1250HP with eight 100lb/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)
  • Requires use of external fuel pressure regulator, Holley PN# 12-886 or equivalent, set to a base pressure of 58.5 PSI
  • Integrated ignition timing control improves idle stability, drive-ability, and wide open throttle response
  • 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 realtime 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
  • Also available in Black, PN# 550-871 and Shiny, PN# 550-870 finishes

 

Application:

Year Make Model Submodel Engine Size
Universal

 

Specs:

Brand Holley Sniper EFI
CFM 870
Emission Code 3
Finish Classic Gold
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: 11561083243

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4.7 ★★★★★
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Ladyshell
Draper, US
★★★★★ 5
First ball was great!
Color: Black Green, Size: 8 Inch
This ball was great! My dog loves it. I ordered another smaller one. It had no pump and the inside was separated from the outside piece so it couldn’t be pumped up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
A
Verified Purchase
AMM
Lowell, US
★★★★★ 5
Fun and durable
Color: Flag, Size: 6 Inch, Color: Flag, Size: 6 Inch
I have a 5 month old teething Whippet puppy and this toy is a favorite. She loves carrying it around by the straps, playing tug, and trying to chew it. I think it’s pretty tough and durable for someone her size. I could see how a shepherd might destroy it quickly, though. I was surprised to find you have to inflate it, but the pump and needles are included and it hasn’t lost any air over several days of rough play. (I kick it and toss it to her. We tug with the straps. She carries it everywhere.) The material feels like a heavy duty soccer ball, just smaller. It’s the perfect size for her. I’d definitely buy it again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
L
Verified Purchase
Leo
Draper, US
★★★★★ 4
It's a (smaller) soccer ball with nylon straps. Will no last long for aggressive chewers.
Color: Black Green, Size: 8 Inch
As the item title states, it's a soccer ball with straps. It feels like a soccer ball, but smaller and doesn't make any noises. The 8 inch size just right for my 50 lb dog. He can't get his mouth around the ball, but can bite down on the straps as we kick it around. He also plays and tosses it around by himself. It's also easy to clean. It's a good item, but suffers from two issues. 01) The nylon straps are tough, but not as durable as I though. My dog is aggressive chewer and has managed to chew them up a bit. 02) There is a nylon strap that is longer than all the others, so he tends to focus on that one. After about 15 days of playing with hit, he's managed to chew that strap up to the point that it's almost falling off. It would be nice if all the straps were the same, larger, size.
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Reviewed in the United States on October 27, 2025
D
Verified Purchase
debra
New York, US
★★★★★ 5
Highly recommend
Color: Black Green, Size: 8 Inch
I was skeptical that it would hold up to our aggressive chewer puppy (staffyX) - especially during teething. But it has survived past teething into adult chompers and is still fantastic! Its his favorite outside toy, especially the tags make it fun (and those have been holding up well too). If/when it fails, I'll buy another one.
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Reviewed in the United States on May 2, 2026
A
Verified Purchase
Amazon Customer
Lexington, US
★★★★★ 3
great design, poor overall quality
Color: Black Green, Size: 8 Inch
My dog loves these balls. The "tags" are a great design. The problem I have is the quality as they aren't tough enough. He goes through them pretty quickly tearing off the tags and puncturing the ball. He doesn't get that these actually cost money! Each one also comes with a small pump, which I guess is great for a one time buy?, but man, if you don't own a pump just buy one and keep one. I have no use for several of these cheap pumps. How about offering the pump as an add-on for a dollar or two?
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 13, 2026

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