The torque on the DSG system is limited to 400Nm on Haldex AWD cars. It would suggest that to Audi's standards, DSG can't take the extra torque of the TT RS. HPA seems to have more faith in the product though, as they have a software flash to raise the torque levels. GIAC has one in the works as well. I guess this torque limit has also been the big issue with remaps for the TTS and S3.