I've got a spec sheet for a Turbodynamics K04 somewhere - not sure if they're offering the same thing.
When I looked, it was "better" than a stock K04, but not that much. Certainly didn't seem worth the money they wanted (not saying they are a rip-off).
I'm sure TD can build a K03S/K04 hybrid - tuning shops that offer these hybrids must be getting them from somewhere
I'll say it again though, if you want to save a few quid, talk to Jacob about remvoving some of the options, although I would say that if you can't go for the full works, don't bother.
It's worth doing to make extra power, but not just to add to your sig.
I'm certain there are companies in the UK who can create a hybrid at least as good as the one i'm importing, the
problem is finding them.
..and telling them to do the right thing, Jacob's turbos are tried and tested.
P.S. On that audi-sport.net/AMD RR Day, the S3 with the hybrid turbo, is (unless he's changed it) an S3 with one of Jacob's turbos, MRC Tuned. Compared to the other S3's there, it did better but outright not stunning. Not seen the curve yet, but the torque figure is there (like Sie's)
Dahlback Inlet as well...