The Edelbrock Pro-Flo 4 XT Sequential Port EFI System #35723 for Chevrolet LS GEN III/IV engines is equipped with the latest in technology and features. The EFI system comes complete with a Pro-Flo XT cathedral port black finish intake manifold and 29 Lb/Hr injectors capable of 450 HP with 58 p.s.i. fuel pressure. The new Pro-Flo 4 EFI systems feature an all-new ECU with a faster processor, a water proof design and measures 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 of your engine. E-Tuner 4 features a simple and easy to use setup wizard to help you get started. The exclusive Edelbrock E-Tuner 4 app is Free and Available for Android and IOS based smart phone or tablet.