JB4 for Infiniti shown with optional wireless connection.
JB4 = FASTEST
JB4 is a plug & play chip tune available for turbocharged vehicles. The JB4 comes preloaded with custom tuning software and up to 8 maps for various fuel and modification levels. The JB4 installs between your car's sensor and its DME/ECU (computer) and manipulates vehicle performance through these connections. Installs and removes without a trace. 5-year warranty.