Holley Sniper HO550-870K EFI Stealth 4150 Fuel Injection System Master Kit

Holley Sniper EFI Stealth 4150 fuel injection systems feature four 100 lb.-hr. fuel Injectors capable of supporting up to 650 hp naturally aspirated or 600 hp on forced induction applications.

The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! This system also includes transmission kickdown provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications. The 4150 is available individually, or in a complete Master Kit (see contents listed below).

ALL Sniper EFI Stealth 4150 systems feature:

• Bolt on 4150 flange carburetor replacement
• Throttle body mounted ECU; no extra boxes to mount
• Supports up to 650 hp with four 100 lb.-hr. injectors
• High-pressure fuel crossover line
• 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 four wiring connections required (battery +, battery - , switched ignition, and rpm)
• External fuel pressure regulator required, set to a base pressure of 58.5 psi, such as 12-886
• Integrated ignition timing control
• High-resolution full color touch screen 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 real-time 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 in. exhaust ensures a leak-free oxygen sensor installation, with stainless steel T-bolt clamps and a stainless steel (weldable) oxygen sensor flange
• Available in three finishes: shiny, ceramic black, and classic gold

MASTER KITS also include complete fuel system with an external fuel pressure regulator preset to 58.5 psi, 20 ft. of 3/8 in. Vapor Guard fuel hose, fuel pump, filters, necessary hardware, and bulkhead fitting to return fuel into the tank.

• Maximum Horsepower with Gas:650
• Injection Style:Throttle body
• Timing Control Compatible:Yes
• Power Adder Compatible:Yes
• ECM Included:Yes
• Self Tuning:Yes
• User Tunable:Yes
• Fuel Pump Included:Yes
• EGR:No
• Transmission Controller Included:No
• Metering Style:Speed density
• Intake Manifold Included:No
• Multi-Port Fuel Rails Included:No
• Throttle Body Included:Yes
• Throttle Body Mounting Flange:4-barrel square bore
• Venturi Quantity:4
• Airflow Rate (cfm):870 cfm
• Throttle Body Material:Cast aluminum
• Throttle Body Finish:Polished
• Injectors Included:Yes
• Injector Size (lbs/hr):100 lbs./hr.
• Calibration Module Included:Yes
• Wiring Harness Included:Yes
• Oxygen Sensor Included:Yes
• Fuel Pressure Regulator Included:Yes
• Distributor Included:No
• MAP Sensor Included:Yes
• IAT Sensor Included:Yes
• TPS Sensor Included:Yes
• IAC Motor Included:Yes
• Quantity:Sold as a kit.
• Special Attention:Master kit includes a filter for before the pump, a filter for after the pump, fittings, clamps and fuel injection hose.