The Edelbrock Pro-Flo 4 XT EFI Kit #35870 for Big-Block Chevy Rectangle Port engines has the latest in technology and features. The EFI system comes complete with a Pro-Flo XT intake manifold and 35 Lb/Hr injectors capable of 550 HP with 58 p.s.i. fuel pressure. Also included is a plug and play single connection distributor designed to work specifically with Pro-Flo 4 and a made in the USA fully terminated high-quality harness with clearly labeled connections for a hassle-free installation. The new Pro-Flo 4 EFI systems feature an all-new ECU with a faster processor, a water proof design and is half the depth of the previous ECU. 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 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.