What am I to do?? My new A5 Quattro TDI 177 Black Edition has just been built and waiting at a German port for shipping. My current 9 year old A4 has had a tuning box for most of its 90.000 trouble free miles. The performance and fuel economy were much better than standard. The dilemma is since looking at forums I see that mapping is the preferred route but then warranty comes in, and when attached to dealership computers it is returned to normal or at least that was what used to happen now I hear that the ECU's are factory locked.
It then appears that the tuning box comes into its own as it has no effect on the ECU or are the new locked ECU's stopped that.
I would prefer to map, but think my option while under warranty is the removable tuning box. Any views on which one is best? if thats the advice