The tune isn't a massive change power-wise, like it was in my old polo gti which totally transformed the car - but it does make the A1 a lot more drivable around town with the extra 45nm or so of torque across most of the rev range. Overtaking is also much easier in 6th gear without having to change down to 5th.
In summary, I think it was worth it but just don't expect the car to be pushing you right back in the seat afterwards
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