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Holley Sniper 550-512 EFI Super 1250 4-Barrel Self-Tuning Kit
Holley Sniper 550-512 EFI Super 1250 4-Barrel Self-Tuning Kit

Holley Sniper 550-512 EFI Super 1250 4-Barrel Self-Tuning Kit

Universal Fit, 800 CFM CFM, 3 Emission Code, Throttle Body Injection Style, Injectors Included

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Holley Sniper 550-512 EFI Super 1250 4-Barrel Self-Tuning Kit
Holley Sniper 550-512 EFI Super 1250 4-Barrel Self-Tuning Kit
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We estimate this item will ship on or before October 23rd.
Part # 425550512
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 2 business days for Sniper to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


MFG. Part #:
Sold in Quantity:
800 CFM
Emission Code:
Fuel Pressure Regulator Included:
Fuel Pump Included:
Injection Style:
Throttle Body
Injector Size:
100 lb/hr @ 58.5 PSI
Injectors Included:
Throttle Body Style:
Throttle Body Injection (TBI)
Throttle Body Barrels:



Want to convert your blow thru carbureted turbo engine to EFI? Well take a look what Holley has for you! The Super Sniper 4150 EFI systems features 8, 100LB/HR fuel injectors capable of supporting up to 1250 HP on forced induction or nitrous applications. Toss that nitrous controller away because the Super Sniper also has full nitrous control built-in! Every Super Sniper EFI system also comes with a USB to CAN tuning cable, as well as free downloadable Sniper EFI software to give you unlimited control of your engine.

  • 1250 HP version features eight 100 Lb/Hr Injectors (Forced Induction)
  • The 800 CFM Main Body will support 700 Horsepower Naturally Aspirated
  • Compatible with Draw thru or blow thru forced induction applications
  • Built-in Single stage progressive nitrous control
  • Programmable inputs and outputs
  • Integrated ignition timing control for precise timing curves
  • Only 4 Wiring Connections Required! (Battery +, Battery-, Switched Ignition & RPM)
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI) for N/A or Nitrous applications
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI
  • 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
  • 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 ensures a leak-free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
  • Throttle body mounted ECU – no extra boxes to mount
  • USB to CAN Communication cable included for easy laptop tuning of advanced controls
  • Compatible with Holley EFI analog gauges and electronic dashes

Quick Start Manual (PDF)

Installation Manual (PDF)




  • For a naturally aspirated engine application only.
  • Not to be used for turbocharger or supercharger applications.
Some parts are not legal for use in California or other states with similar laws/regulations

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