After several MTM upgrades I finally went for a local tuner, very reliable and known here in Italy. I enclose a graph. Now I'm really satisfied with my S3 2001. Modified ECU, Oettinger central and final exhaust, Forge, ITG filter, hand made modification of air box. You can see two figures (279bhp and 286bhp), the worst and the best of 4 rolling roads.
Cheers