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Originally Posted by dizx
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Wow that's a nice upgrade.
I have a 2017 build 125i M Sport and would love to do this but I've been told the electronic black box here is monitored and BMW would even know if you flashed the ECU and restored it afterwards for a service.
Is there a BMW approved tune? I remember in some countries the Audi dealer would offer an MTM reflash upgrade as an extra option.