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I have had the Dinan tune on my N26 Xdrive and it I am very happy with the performance difference. Really wakes the car up. I have not noticed any mileage penalty in everyday driving.
Unfortunately, I am suffering from a very noticeable buzzing when the car is warmed up and just at idle say at a stop light. If I shift into park the buzz goes away. I also notice some buzzing between 1100 and 1500 RPM. I'm guessing this is just a fitment issue somewhere and not the actual tune. The dealer has the car now and is trying to track it down since I had the tune put in by a speed shop and they are pretty confident it isn't the actual turbo. We will see.
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