TDI-Tuning produces plug-in performance tuning boxes (piggyback modules) that optimise fuelling and boost for extra power and torque on turbo diesel and petrol engines. The units install inline without permanently altering the factory ECU, and many feature Bluetooth app control with adjustable maps. It is a popular, reversible way to unlock more performance and drivability. Black Hawk Japan carries the TDI-Tuning range of tuning boxes for a wide range of vehicles.