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Sniper Stealth 4150 Gold Finish

$1,510.00 Sale:$1,358.95

Sniper EFI

Model #550-872

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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?

Master Kits include 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!


  • 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: EFI
  • Transmission: 700R4/200R4
  • Transmission: Ford C4/C6
  • Transmission: TH350
  • Warning: California Proposition 65
  • Bolt on 4150 flange carburetor replacement fits 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
  • Includes high pressure fuel crossover line allowing you to quickly plumb your fuel system
  • 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


Proposition 65

/!\ warningWARNING: Cancer and Reproductive Harm

Sniper EFI

The company Holley introduced a new category called the Sniper EFI. A reasonably priced product enables customers to take advantage of EFI while still having enough money to finish or upgrade the rest of their bikes. It is ideal for street rods, muscle cars, off-road trucks, and any carbureted vehicle. Cold starts, hesitations, vapor lock, and flooding are no longer an issue. It's excellent for any car in standard with a 2300 Holley Flange, including some Fairlanes, Galaxies, Falcons, Comets, F100s, Javelins, Rebels, Mustangs, Thunderbirds, Cougars, and more. The best thing is its affordable price range because it allows one to benefit from EFI while still having money left over to finish or enhance their ride. It can also be easily converted to a 4bbl intake with a square flange or Q-jet flange using a Mr. Gasket adapter.


The Sniper EFI tuning kits have dual Pattern bolt-on carburetor replacement and are designed to fit 4150 Flange & Spread Bore manifolds. There are no added boxes to escalate with throttle body-mounted ECU. It can support up to 650hp with Four 100 Lb/Hr. Only four wiring connections are needed by the injectors. The regulator for the internal fuel pressure removes any hassle of installing an external fuel pressure regulator.

Product Line

The product line of Sniper EFI includes Sniper EFI 4BBL, Sniper EFI STEALTH 4500, Sniper EFI STEALTH 4150, Sniper EFI QUADRAJET, Sniper EFI 2300 2BBL, Sniper EFI BBD FOR JEEP CJ, Sniper EFI 2GC, Sniper EFI AUTOLITE 1100 ONE BARREL, complete system kits, full tanks, and sniper hyperspark ignition.


The products of Sniper EFI at Vivid Racing are Sniper EFI 2300 self-tuning kit classic, master kit shiny finish, hall effect distributor, kit-fuel injector, air plug, and many more on our website.

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