SKU: 24204323224

Holley 550-870K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master Kit

Sale price$854.98 Regular price$949.98
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Description

Holley 550-870K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master KitOverview: 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 Shiny
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: 24204323224

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DsD
Pawtucket, US
★★★★★ 5
Where has this been my whole life
Set name: Face - 1.7 oz., Set name: Face - 1.7 oz.
Let me give you some background. I’m middle eastern. That means I tan well but have two different skin tones; my January skin and my July skin. I wear a watch and I’ve been out of the sun since September. My tan hasn’t totally faded but the lighter band, that’s my real skin color. That’s how I want to be all over. I always try to make better choices in my skin products. I have tried so many mineral based sunscreens for my face and body but I usually end up returning to a chemical based one for several reasons. HOWEVER, I have finally found the product I’ve been searching for. Blue Lizard leaves no white cast on my skin. It’s easy to rub in. It also does not get trapped in my dense, black eyebrows the way other products did. It would gross me out and look like I had flakes in my eyebrows. I just spent the week at Universal Studios and I did not burn. I didn’t tan either, which is great. Tanning is also a sign of sun damage. Chemical or mineral sunscreens often prevent sunburn but I still tan. I don’t want either. I am sold and will continue to buy this product. I feel great about that it has safer and better quality ingredients.
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Reviewed in the United States on April 4, 2026
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D. Kraus
Lowell, US
★★★★★ 5
Works well but oily.
Set name: Face - 1.7 oz.
This works well but is not ideal if you want to wear under makeup. It has a very oily consistency. Price is good.
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Reviewed in the United States on November 1, 2025
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RDL
San Leandro, US
★★★★★ 3
packed poorly, no respect for customer
Set name: Face - 1.7 oz.
Nice product Poor packaging Wonder if grey market
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Reviewed in the United States on June 6, 2026
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Mackenzi Husted
Dallas, US
★★★★★ 5
Safe for baby
Size: 6 Fl Oz (Pack of 2)
Safely and smoothly applied. Baby had no burns. High quality product.
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Reviewed in the United States on November 21, 2025
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Dean
Chelsea, US
★★★★★ 5
Will buy agian
Size: 6 Fl Oz (Pack of 2)
We love this it works amazing for the pool and you get what feels like a ton of product
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Reviewed in the United States on January 8, 2026

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