I believe the TTRS may have uprated driveshafts and possibly prop shaft but this would need more research. I have been told you can do a rear hub swap to Quattro TT with uprated driveshafts for launching and to allow figment of C5 RS6 335 mm rear discs for instance.
I would be interested to hear about any information you find.
Audi have 100% uprated the prop shaft and the bolts i was told that the part number for my prop shaft has been superseded due to an uprated part, i found this out through the Audi Specialists that i used, newcastle Audi denied the part had been uprated when i asked the lying tw-ts.!!
Anybody buying these bolts i hope you will listen when i say that you should fit these the day you get them to save the hassle i had.