As the lengthy title asks, does anyone have any experience on the following:

- Do Tuning boxes cause the car to flag to Audi they were being manipulated at one point? As I assume if the cars is in Audis hands the tuning box is not present. And does the TD1 code just get applied by Audi? If I service at my local friendly Audi specialist assume this is not connected to big brother (Audi)??

- If it does can you clear error codes through VCDS?

- Has anyone fitted such a box to a BITDI. Or even better have experience of both? Assume it does as asked but having read other comparisons (Golf GTD) the DTUK boxes appear to be smoother and the TDIs more savage? Is this right?

- Can the gearbox cope with the extra torque? My 535d when mapped I believe was at its max (508 LB/FT)