Holley 550-871K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master Kit Features:

• Holley 4150 flange EFI carburetor replacement
• Supports up to 650 naturally aspirated HP or 600 forced-induction HP using (4) 100 lbs./hr Injectors
• 870 CFM flow rate
• All system wiring exits below the rear fuel injector cover, for a complete stealth installation and appearance
• 2.5 Bar MAP sensor
• Integrated ignition timing control
• Throttle body mounted ECU
• (4) wiring connections required (Battery +, Battery -, Ignition, RPM)
• High-resolution color touchscreen controller
• Calibration wizard tunes ECU without the use of a computer or extensive engine tuning knowledge
• Genuine Bosch LSU 4.9 wideband oxygen sensor provides realtime fuel map learn
• OEM-style throttle position sensor (TPS) and idle air control (IAC)
• 2.500 in. clamp-on oxygen sensor kit allows easy integration into older exhaust systems
• High-pressure fuel crossover line included
• Complete fuel system including 20 ft. of 3/8 in. Vapor Guard Fuel Hose, external fuel pressure regulator, fuel pump, filters, necessary hardware and bulkhead fuel line return fitting
• 3.280 in. overall height
• -8 AN (3/4-16) female O-ring inlet/outlet 
• Kickdown provisions for GM: TH350, TH400, 200R4, 700R4 Ford: C4, C6
• Compatible with Holley Ultra XP Carburetor drop base air cleaners as well as most stock-style air cleaners with air cleaner locator provisions

Installation Notes:

Sniper Stealth 4150 EFI requires an external fuel pressure regulator (sold separately) that is capable of a base pressure of 58.500 PSI.

For Troubleshooting Tips setting up your New Holley Sniper EFI System, please see this helpful video from Holley Performance.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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