05 Dec 2015 admin BMW, M6 F06/F12/F13 December 5, 2015 admin BMW M6 Gran Coupe F06 with ETG ECU Upgrade Instragram post by @ecutuninggroup: BMW M6 tuned with a direct flash to the ECU’s. Car was also tuned for cat-less down pipes so there’s no check engine light and the speed limiter was also removed. bmw, bmw m6 ecu, etg, etg ecu upgrade