The JB4 from Burger Motorsports is a programmable computer that connects to the ECU and vehicle sensors, enabling it to fine-tune your car’s tuning by accessing hitherto untapped sections of the original flash mapping. Unlike other similar-looking tuning systems, the JB4 can connect to CANbus (akin to a spinal chord), enabling it to interact with and receive data from a variety of sources, including the ECU, transmission computer, stability control module, dash module, and more. A flash tune, on the other hand, directly alters the tables on the ECU for improved performance. Typically loaded via the vehicle’s gateway through the OBDII connector, but in certain cases, directly to the ECU by cutting a hole or dismantling the ECU to reach the processor within.