Holley EFI 550-870 4150 Sniper Stealth

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US$639.98
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US$639.98
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Free shipping Free 30-day returns

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Management number 254745711 Release Date 2026/11/07 List Price US$639.98 Model Number 254745711
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4 Barrel Fuel Injection Conversion Kit + Handheld EFI Monitor - Shiny Finish;<br><br>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 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.<br><br>For a complete installation, Master Kit part # 550-870K includes 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, necessary hardware, and bulkhead fitting to return fuel into the tank!;

  • Bolt on 4150 Flange Carburetor Replacement
  • Throttle body mounted "brain box", 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)
  • An external fuel pressure regulator is required, set to a base pressure of 58.5 PSI, e.g. 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 brain box means you don't have to be a computer wiz to have EFI!
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
  • OEM Style TPS/IAC 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
  • vailable in 3 finishes: Shiny, Black and coming soon, Gold
Manufacturer part number 550-870
Automotive specialty part type Fuel Injection Conversion Kit
Vehicle fitment type Specific
Vehicle make Ford
Vehicle model 4150 EFI Conversion Throttle Body
Brand Holley Sniper EFI
Weight 10.15 lb
Material Stainless Steel
Finish Shiny
Color Multicolor
Items included 4 Barrel Fuel Injection Conversion Kit, Handheld EFI Monitor
Vehicle type Car
Automotive parts division Performance
Model 550-870
Count per pack 1
Has written warranty No

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