Pro-Flo 4 EFI System #357800 is an advanced sequential-port EFI system for Small-Block Chevy engines with Vortec/E-Tec cylinder heads. This EFI kit is a direct bolt on and incorporates a single-plane Victor style intake manifold with square-bore 4150-style throttle body. The Pro-Flo 4 EFI #357800 is compatible with factory-style Cylinder Heads or Edelbrock Performer series Cylinder heads. Pro-Flo 4 EFI manifold comes preassembled with throttle body, 29 lb/hr injectors and fuel rails. Also included is a distributor designed to work specifically with Pro-Flo 4 providing fully sequential port injection and infinite control over ignition and fuel events. This system is rated for 450 horsepower at 58 PSI with all supporting sensors, ECU and wire harnesses for a streamlined installation. Key Pro-Flo 4 features are Self-Calibrating Fuel Map Technology, Wide-Band O2 Closed Loop Mixture Control and Bluetooth connectivity. E-Tuner Android Software includes a Setup Wizard to guide you through setup and provides fuel and spark adjustability for complete EFI Management. Pro-Flo 4 EFI requires no laptop tuning. Minimal setup and tuning adjustments are required with base calibrations provided in the software. The ECU is self-learning and will continually adjust the fuel injection calibration for maximum performance by maintaining a specified target air-fuel ratio as you drive. E-Tuner Software provides the ability to fine-tune air-fuel ratios, ignition curve, idle speed, acceleration fuel, fans, rev-limiter and more. Multiple displays let you monitor engine performance in real-time from inside or outside of the vehicle. Best of all, the E-Tuner 4 app is free and can be downloaded from the Google Play Store, allowing you to use your personal Android based smart phone or tablet. Please Note "Kit 357800 DOES NOT include a 7" Android tablet". If you don't have a compatible device, please refer to EFI kit #35780 that includes a 7" Android tablet with the E-Tuner 4 app installed.