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Sniper EFI 550-871K Stealth 4150 Self-Tuning Fuel Injection Master Kit Black

(Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Bronco 1984-87, Thunderbird 1955-76 + 581 more models)

Manufacturer

Picture for manufacturer Sniper EFI

Part Number

550-871K
7 reviews
Sale Price

$1,949.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Sniper EFI 550-871K Stealth 4150 Master Kit transforms your carbureted engine into a modern fuel-injected powerhouse with minimal installation complexity. This complete EFI conversion system features integrated ignition timing control and a self-tuning ECU that eliminates the need for advanced tuning knowledge, making electronic fuel injection accessible to enthusiasts of all skill levels.

Key Features:

  • Direct bolt-on replacement for 4150 flange carburetors with no additional mounting modifications required
  • Throttle body mounted ECU eliminates the need for separate control boxes and complex mounting
  • Self-tuning capability uses real-time data to optimize fuel maps automatically
  • High-resolution full-color touchscreen for intuitive setup, tuning adjustments, and gauge displays
  • Simplified installation with only 4 wiring connections: Battery positive, Battery negative, Switched ignition, and RPM signal
  • Includes genuine Bosch LSU 4.9 wideband oxygen sensor for precise air-fuel ratio monitoring
  • Stealth black finish with all wiring routed below the rear fuel injector cover for a clean, factory appearance
  • Air entry machined to accept most stock-style air cleaners with standard locator provisions
  • Integrated ignition timing control for optimal engine performance

System Requirements:

  • External fuel pressure regulator required, set to 58.5 PSI base pressure (such as part number 12-886)
  • Compatible with engines using 4150-style carburetor flanges

This master kit includes everything needed for a complete EFI conversion, delivering improved throttle response, better fuel economy, and easier cold starts compared to traditional carburetor setups. The Stealth 4150's compact design and hidden wiring make it ideal for builds where maintaining a clean, period-correct appearance is important while gaining the benefits of modern fuel injection technology.

Products specifications

Fits

Ford F-150 1975-79, 1984-87, Mustang 1964-73, 1983-85, F-250 1955-66, 1973-79, 1983-87, Bronco 1984-87, Thunderbird 1955-76, F-350 1955-79, 1983-87, Galaxie 500 1962-64, 1968-74, F-100 1955-66, 1973-76, 1979, Fairlane 1955-70 + 577 more models

Accelerometer Support

No

Boost Control

No

Brand

Holley Sniper EFI

CAN-BUS Support

No

Category

Air and Fuel Delivery

CFM

870

Coil Per Cylinder Ignition Support

No

Datalogging Support

Yes

Distributor Included

No

Dry Nitrous Control

Yes

e85 Support

No

EGT Support

No

Emission Code

3

Finish

Black

Flange Style

4150

Forced Induction Support

Yes

Fuel Filter Included

Yes

Fuel Hose Included

Yes

Fuel Injectors Included

Yes

Fuel Pressure

58.5 PSI

Fuel Pressure Regulator Included

Yes

Fuel Pump Flow Rating

240 LPH

Fuel Pump Included

Yes

Fuel Pump Type

Inline

Grade Type

Performance

Height

3.28"

Ignition Timing Control

Yes

Individual Cylinder Fuel Corrections

No

Injector Size

100 lb/hr @ 58.5 PSI

Inlet / Outlet Size

3/4-16 Female O-Ring (AN 8)

Intake Manifold Included

No

Knock Retard Support

No

MAP Sensor

2 Bar

Max Horsepower Rating

650 Naturally Aspirated

Model

4150 EFI Conversion Throttle Body

Multi-Stage Nitrous Control

Yes

Part Type

Fuel Injection Conversion Kit

Product Type

Sniper Stealth EFI 4150 Master Kit

Progressive Nitrous Control

Yes

Self-Tuning

Yes

Sub Category

Service Kits

Throttle Position Sensor Included

Yes

Traction Control Support

No

Transmission

700R4/200R4, Ford C4/C6, TH350

User-Tuneable

Yes

Warning

California Proposition 65

Wet Nitrous Control

Yes

Excellent customer service, fast shipping and good quality products. Thank you Boatplicity Team

aok

Great prices and super fast check out thanks

Received my order with no problems and in a timely manner. Would order from here again

Quality product just as advertised quick shipping. No problem it fits Sammy out.

Easy to use.

Excellent service

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