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One of my friends has his E90 320i remapped the ECU.......It's a well-known company from UK called Superchips.
He said after remapping the software, his car runs smoother, has more torque and consume less gas.......
I haven't driven my friend's car yet but I will .........It's very tempting
The guy at Superchips confirmed that the engine will gain approx. 10% from remapping
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