The RK Autowerks Stage 1 S63TU tune yields an additional ~90WHP and ~125WTQ safely for the moderate consumer looking to get more out of his or her M5.
This software is calibrated to the maximum capacity of the OEM hardware. This software should not be used with additional piggybacks of any kind as it is already fully tuned through ECU software directly.
-Removed cat check option for off-road use
-Removed cold start cat heat up cycle
-Linear torque option for reduced bottom end torque for drivetrain longevity