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A Flash Tune is surely better, but with the locked DME it's a problem.
I was even told that after the unlock with an OTA Update, there could be problems again and the lock would disappear.
The question is how much power do you need?
With a box you get in the range of around 350hp and with a real chip tuning some have reached around 400hp.
I personally use a Speedbuster tuning box (similar to RaceChip) and it has brought 77PS/100Nm.
Original was measured at 287hp/438Nm and now has 364hp/538Nm.
( 45.000Km with no problems so far )
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