You're right about the Porsche story, they are the only manifacturer that uses those turbo's.
The whole idea behind them is that they can have both the big and small turbo geometry in one turbo because of the titanium fins in it used to direct the air. A big plus is that when using these turbo's correct, you don't need a waste gate.
I think this isn't a viable idea for the 3S cars, even for any car unless the whole engine and computer is adapted or designed aroung those turbo's. They run at alot more than $5K a pop
