Do you mean if they were offered new? Otherwise how would an insurance company know if you retrofitted a turbo to your bike?It would be awesome to have that kinda power, but on the flip side, for us younger guys it would suck for insurance. I was planning on doing it to mine eventually, and rebuild and beef up the motor but can't do that anymore.
I would totally buy one. However it would kinda suck for anyone with +04 since we don't have the holes running up through the frame like the '03's do.