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I run a DTUK box for awhile it was the twin channel, fuel and boost sensors. It worked well but in end went down the root of the performance pack which turned out to be best thing. Its now in my mates 520D auto and he loves it.
At same time if car is out of warranty a simple remap by a reputable firm even if it means ECU out is not end of the world
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F30 335i M Sport - now departed
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