Fi EXHAUST Pro App is developed for Frequency Intelligent Exhaust high performance valvetronic exhaust systems. The App allows users to control and customize exhaust valve switch using Bluetooth. Special Features More detailed customization features 1. Choose between Engine RPM, Speed or Turbo Boost to automatically open and close the valve/s. Automatic valve mode preferences can be set based on driving habits or special circumstances. 2. Open and close the exhaust valve/s manually. 3. Set defa