Ready to unleash the true power of your BMW F90 M5? In this step-by-step DIY ECU unlock tutorial, you’ll learn how to safely unlock your ECU for custom tuning. Whether you're aiming for more ...

Through the ECU, boost is increased to 19.1 psi (from 17.4 psi in the Turbo S) in regular mode and 21.3 psi (19.6 psi/Turbo S) in overboost mode. See All 14 Photos ...

All is not lost for those driving a modified car in need of a smog check, though. The state government says drivers can simply restore the ECU to the OEM standard, pass the smog test and then do ...