The Edelbrock Pro-Flo 4 XT EFI Kit #35923 for Chrysler big-block 413, 426, 440 RB engines is a fully sequential multi-port injection system designed with a fuel injector strategically positioned in each runner of the intake manifold to deliver the best fuel atomization and most even distribution to each cylinder. This system features a black powder-coated Pro-Flo XT manifold that comes preassembled with high-flow injectors, fuel rails and 90mm throttle body. All supporting sensors, wire harnesses and ECU are included. The high-performance Pro-Flo XT manifold is designed with a large plenum and long tapered runners for high-horsepower and/or large cubic-inch applications. This kit uses 35 Lb/Hr injectors and is rated for 550 horsepower at 58 PSI of fuel pressure. It also has an upgraded Bluetooth chip that is faster, more reliable and will not drop connection. We've added more features for the advanced tuner giving you control over air-fuel ratios, ignition curve, idle speed, acceleration fuel, coolant fans, Rev limiter while retaining the simplicity Pro-Flo is known for. The key to the system is our exclusive E-Tuner 4 app with dyno developed base calibrations. The E-Tuner 4 app uses a Bluetooth wireless connection to communicate with the ECU's self-learning capability to continually adjust the calibration to get the maximize performance. E-Tuner 4 app features a simple and easy to use setup wizard to help you get started as well as multiple dash displays so you can monitor your engines vitals. The exclusive Edelbrock E-Tuner 4 app is Free and Available for Android and IOS based smart phone or tablet.