The big problem micky is that the shaft that is used has a thicker bore where the compressor wheel slides on, which rules out using all the ct9 range of compressor wheels. You could however drill the compressor out to fit but then your running the risk of weakening it and causing balance problems. I could find out if I can source the k1 shafts, obviously they would need to be paired with 11011 turbine housing, again the bearing housing have a slight differences too, they take a heat shield behind the head of the shaft. Would be a little more lag than a conventional hybrid I would guess, maybe k1 users could confirm? I once built a hybrid using a custom shaft that I made which was huge compared to stock ct9 and it took a hell of a lot of work to machine the turbine housing, that was a bit more lag but the kick it gave at mid range was worth it, made 198 at 1 bar on that one but the power delivery was great on road. I was restricted on compressor end due to the problem I stated above, so comp end could have been more impressive and I'm sure it would have made bigger power figures.