Holley EFI 550-870K 4150 Sniper Stealth Master Kit
Holley EFI 550-870K 4150 Sniper Stealth Master Kit
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Holley EFI 550-870K 4150 Sniper Stealth Master Kit

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Key item features

  • Direct Replacement: This system offers a bolt-on 4150 flange carburetor replacement, integrating a "brain box" directly onto the throttle body for a clean installation.
  • Powerful Performance: Supports up to 650 horsepower with four 100 Lb/Hr injectors for naturally aspirated engines, or 600 HP for forced induction applications.
  • Stealthy Wiring: All wiring exits discreetly below the rear fuel injector cover, ensuring a completely stealthy installation.
  • Simplified Setup: Requires only four wiring connections (Battery +, Battery -, Switched Ignition & RPM) and includes a high-resolution full-color touchscreen for initial setup and gauge displays.
  • Self-Tuning Capability: Features a simple calibration wizard and a self-tuning brain box, utilizing a Genuine Bosch LSU 4.9 Wideband Oxygen Sensor for real-time fuel map learning.
  • Comprehensive Kit: 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, and necessary hardware.
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4.8 out of 5 stars
stars4 ratings3 reviews
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Showing 1-3 of 3 reviews

May 8, 2020
Tom 1955
5 out of 5 stars review

Work great

I decided to try this Sniper System to help eliminate tuning a carb on new engine I installed in my Chevelle. I recommend you watch the install video a couple of times The manual is a on line PDF file and try to understand it all before installing. After reading and watching it is a easy operation. The wires are easy enough and I used a in tank fuel pump kit for my instal I chose that over drilling a hole in fuel tank for a fuel return line. Now I just drive and watch it tune itself. So far so good!!!!

Review from jegs.com
Helpful?26I0BF5FJHV2243589476
May 22, 2020
Philm68
5 out of 5 stars review

Easy install

Installed in 2 days with fuel system and hyperspark. Awesome and easy to use!

Review from jegs.com
Helpful?26I0BF5FJHV2243589476
Nov 5, 2020
super chevy
4 out of 5 stars review

Works great

System is great and easy to install the only problem is the kit is not complete it doesn’t come with the two into one fuel line you have to order it separate part # Holley 34-42 and it $124.00 which is no big deal but it says this is a master kit which should include everything. It cost me about two days wait time but I’m very pleased with it

Review from jegs.com
Helpful?26I0BF5FJHV2243589476