s63tu JB4 Tuner For BMW F10 M5, F12 M6, F85 X5M, F86 X6M w/ OBDII & Integrated BCMExpect power gains of around 100whp over stock. Our latest kit for the S63TU M5 M6 X5M X6M, the new JB4 includes functions never before available to the platform, including on the fly map switching, boost limiting in lower gears for improved traction, an in dash boost gauge, full CANbus data logging, code read delete, integrated water methanol tuning with progressive safety systems, and the ability to tune for as much boost as your octane and or fuel