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Remap is always better so long as its a good one. I ran an E-Maps 350bhp/700nm tune on my 535d for 90k+ miles without any issues at all. The remap will make a wider range of changes compared to a tuning box which basically fools the ECU into overboosting and over fuelling by telling it that the boost pressure is lower than it actually is. PLUS your dash shown mpg etc will likely all be inaccurate with a 'box.
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