SKU: 28535633596

Holley 550-872K Holley Sniper EFI Stealth 4150 Kit - Classic Gold Finish

Sale price$877.48 Regular price$974.98
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Description

Holley 550-872K Holley Sniper EFI Stealth 4150 Kit - Classic Gold 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 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? Part # 34-42 is required for a bolt-in installation.

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: 28535633596

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4.3 ★★★★★
Based on 12 reviews
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InspirationalReader
Cuba, US
★★★★★ 5
Great dog toy! Good quality!
Color: brown1
Great quality dog toy! The rope is thick and not easy to break. Fun toy for my medium-sized dog who loves to tug-of-war with me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
E
Verified Purchase
Edilla
Lowell, US
★★★★★ 3
For small dog
Color: brown4, Color: brown4
It's cute for the price, but it's meant for small dogs, it's very easy for medium-sized dogs to destroy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 10, 2026
R
Verified Purchase
Robert A.
Louisville, US
★★★★★ 5
Small Pug Enjoyment For All!
Color: brown1, Color: brown1
We got this toy to replace an earlier purchase for a rope/squeak toy after finding he loved a holiday purchase by an Aunt which squeaked but was not really meant for tugging/heavy playing like he wanted too, for our half pug/schnauzer Mr. Pug. Compared to the first toy and the attempted replacement he ADORES this toy! As you can see in the above picture he has truly laid his claim to it! About the product in general though, we found it surprisingly sturdy all around, even with heavy tugging and aggressive play. The interior padding is durable it seems, and holes where the rope come out have a heavy duty padding for the target dog audience like ours in preventing him from chewing or tearing it up. The crinkly ears were also an enjoyable surprise for him, and the squeaker can move around the torso area of the toy keeping him actively looking for it when he desires it. All in all we would certainly get another toy like this in the future.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 25, 2025
T
Verified Purchase
the banquets are super nice and strong
Chelsea, US
★★★★★ 5
Perro
Color: brown1
A mi perro le encanto ese juguete, lo recomiendo
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
D
Verified Purchase
doughbowlmaker
Bozeman, US
★★★★★ 5
Great wrestle or chewing toy for your pet.
Color: brown1
My 4 legged "little boy" loves to play, even at 10 years old but is getting a tad "over the hill" for chasing a ball. This toy has brought him (and me) many hours of fun as it can be played with in the house without chance breaking something (it is soft) and was fairly well thought out - being made with the "squeeker" in one end, and a couple of ropes sewn in to provide a "tug of war" when he is really feeling frisky. I've had it around 6 months and it has only incurred minor damage and really just normal wear and tear considering what it has gone thru. A great toy for the price that your pet may play with by itself, or one you can use to wrestle with it so you can be part of the action. When this one is finally torn apart, I will be buying another one (if the dog out lasts it), or I will bury my pet with this one if it out lasts him. It's that special.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 30, 2026

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