(Compatible with the long-awaited 2021 2022 model) Compatible with 2021 Softail, Touring (CVO), Interface is a smartphone app (iOS and Android), Connect to your smartphone via Bluetooth and readjust the ECM through flash tuning, download the base map from a huge amount of data that was performed by Vance & Hynes. Then, more accurate tuning. Auto tune function (automatic adjustment) / Live sensor data (rotational count, gear position, cylinder temperature, voltage, etc.). [New functions] "Performance data" function has been added. Record routes and data that are actually running through your smartphones GPS and compare and analyze the data after driving. The idle can be adjusted. The FP4 can also be used with mufflers and air cleaners other than Vance & Hynes. (North American Scarf, Screemine Eagle, Clearkin, Freedom Performance, Chrome Works, etc) "Worried about whether there is a map of your muffler..." We will guide you on the map that matches the specifications of your vehicle. 1) Please call to see if you have a map that will fit your scarf. 2) After purchasing the product, we will advise you the best map for your scarf. 3) By using the map "auto-tune" it will be a more accurate map.