Holley Sniper EFI 550-516K Black EFI Kit sku-778849177

The Holley Sniper EFI 550-516K is a Black carburetor-replacement kit in Performance Fuel, Carburetors and Intakes (sku-778849177; UPC 090127001493). Its dual-pattern mounting fits 4150 flange and spread-bore manifolds; a spread-bore sealing plate, part #9006, is recommended. The ECU mounts on the throttle body, so there is no separate box to mount.

It supports up to 650 hp with 4 injectors rated at 100 Lb/Hr each and needs four wiring connections: battery positive, battery negative, switched ignition and RPM. The fuel system includes a pump, filters, hardware, a bulkhead return fitting and 20ft of 3/8-inch Vapor Guard fuel hose. An internal regulator is preset to 58.5 PSI.

The kit has ignition-timing control and a coil driver, plus a color touchscreen for setup, tuning and gauges. Its calibration wizard creates a base map from engine details and starts self-tuning without a laptop. A Bosch LSU 4.9 wideband oxygen sensor supplies fuel-map learning data. It also has OEM-style TPS/IAC and a fuel-pressure regulator.

A clamp-on oxygen-sensor installation kit includes stainless-steel T-bolt clamps and a weldable stainless-steel flange. Patent pending.