The Bully Dog BDX is a high performance, flash-and-go handheld tuner for both gas and diesel vehicles. The BDX provides custom dyno-proven performance tunes that increases horsepower and torque. Unlike other devices that ship with outdated tune files, the BDX always downloads the latest files tailored for your specific vehicle via the cloud and built in WiFi. The BDX tuner also monitors a wide range of critical engine and transmission parameters while giving you custom gauge views.