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Holley Sniper EFI

Holley Sniper Stealth 4150 Master Kit - Classic Gold

Supports Up To 650HP - 3.5 in. Handheld Monitor - Carburetor Styling - Return Fuel System

Part # 550-872K Be the first to write a review

Holley Sniper Stealth 4150 Master Kit - Classic Gold

In Stock
Free Shipping - Lower 48 US States
$1,749.95
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3

Emissions

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

See Emissions Details

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Holley's Sniper Stealth 4150 Master Kit gives you carburetor styling but functions just like the Sniper! A 4150 stealth is a great way to upgrade your ride to fuel injection in a cost-efficient way with just 4 simple connections required. Take your build to the next level and take advantage of improved engine performance, better MPG's and easier starting. This kit supports up to 650hp naturally aspirated and 600hp boosted with Four 100 Lb/Hr injectors! You don't have to be a computer wiz or tuning professional to run a sniper kit on your build. Simplicity is what we strive for! Our calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. The stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications. The 4150 includes a complete fuel system consisting of all necessary hardware to return fuel into your tank. Additionally, you're getting a 4.9 wideband oxygen sensor with a leak free oxygen sensor, oem style TPS/IAC, fuel pressure regulator, all Stainless Steel T-Bolt clamps and a Stainless Steel weldable flange. Once you made your conversion to EFI, don't stop there! Sniper is an Ecosystem! This kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build. Part # 34-42 is required for a bolt-in installation.

Features:

  • Bolt on 4150 flange carburetor replacement fit’s a wide range of factory intake manifolds
  • High resolution full color touchscreen for initial setup, tuning, and gauge displays
  • 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
  • Requires use of external fuel pressure regulator, Holley PN# 12-886 or equivalent, set to a base pressure of 58.5 PSI
  • Bolt on 4150 Flange Carburetor Replacement
  • Integrated ignition timing control improves idle stability, drive-ability, and wide open throttle response
  • 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 realtime fuel map learn!
  • OEM style TPS/IAC and fuel pressure regulator, for years of dependable service
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • 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
  • Only 4 wiring connections required! (Battery +, battery - , switched ignition & RPM)
  • Also available in Black, PN# 550-871 and Shiny, PN# 550-870 finishes
  • Throttle body mounted ECU – no extra boxes to mount
Accelerometer SupportNo
Boost ControlNo
Brand Holley Sniper EFI
CAN-BUS SupportNo
CategoryAir and Fuel Delivery
CFM870
Coil Per Cylinder Ignition SupportNo
Datalogging SupportYes
Distributor IncludedNo
Dry Nitrous ControlYes
e85 SupportNo
EGT SupportNo
Emission Code3
FinishClassic Gold
Flange Style4150
Forced Induction SupportYes
Fuel Filter IncludedYes
Fuel Hose IncludedYes
Fuel Injectors IncludedYes
Fuel Pressure58.5 PSI
Fuel Pressure Regulator IncludedYes
Fuel Pump Flow Rating240 LPH
Fuel Pump IncludedYes
Fuel Pump TypeInline
Grade TypePerformance
Height3.28"
Ignition Timing ControlYes
Individual Cylinder Fuel CorrectionsNo
Injector Size100 lb/hr @ 58.5 PSI
Inlet / Outlet Size3/4-16 Female O-Ring (AN 8)
Intake Manifold IncludedNo
Knock Retard SupportNo
MAP Sensor2 Bar
Max Horsepower Rating650 Naturally Aspirated
Model4150 EFI Conversion Throttle Body
Multi-Stage Nitrous ControlYes
Part TypeFuel Injection Conversion Kit
Product TypeSniper Stealth EFI 4150 Master Kit
Progressive Nitrous ControlYes
Self-TuningYes
Sub CategoryService Kits
Throttle Position Sensor IncludedYes
Traction Control SupportNo
Transmission700R4/200R4, Ford C4/C6, TH350
User-TuneableYes
Wet Nitrous ControlYes
UPC090127078693
Part Number550-872K
3

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.


The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle


WARNING: It is against the law to install this part on an Emissions Controlled Vehicle


The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Holley EFI Dealers
Do you need a custom kit built for your application? Do you need a system installed and tuned? Click here to find the Holley EFI dealer in your area!
Sniper EFI SD Card Contents
Sniper EFI SD Card Contents
Instructions - 199r11971.pdf
Instructions - 199r11970.pdf
Part # 534-247 is required to complete installation.

Have a question about this product?

  • Question

    Does this model have the kick-down for c4 & c6 transmissions?

    By kirk b. on April 22, 2021

    Answer
    Yes, this kit does have the provisions for the C4/C6 transmission kickdown.
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    Some parts are not legal for use in California or other states with similar regulations.