Factory Refurbished - Holley 4150 EFI 550-510 Self-Tuning Throttle Body Kit;Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spread Bore manifolds - (Spread Bore Sealing Plate Part #9006 is recommended); Throttle body mounted ECU – no extra boxes to mount; Supports up to 650hp with Four 100 Lb/Hr Injectors!; Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM); New Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI); Integrated ignition timing control & New coil driver; 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!; Available in base & master kits (Master kits include complete fuel system consisting of; 20ft of 3/8" Vapor Guard Fuel Hose, 12-920 Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!); 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 ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange; Certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. Making Sniper EFI the perfect choice for carburetor to marine fuel injection conversions!; A Flame Arrestor is REQUIRED for marine installations, such as part number, 720-1 or 720-13; Patent Pending; ECU and 3.5" Touch Screen are tested and updated to latest firmware.; Injectors are flow checked; All sensors are tested; Holley Sniper EFI Factory Refurbished throttle bodies may have scr