[Garen]

Call TWM induction in Goleta, CA, and ask. They have two different setups for 911s, and also have many non-Porsche applications as well.

And, you are right. Many $$$ setups do run them. Pat Williams has a complete twin-turbo build on his website with some trick ITB's, the 935/956/962/911GT1 all run ITB's, and so do Champ cars (actually, I think I remember reading somewhere that Champ cars have ITB's, and also a single TB at the plenum - sounds weird, but I remember reading it somewhere).

Downside, too much $$$, possibly hard to get a consistent vacuum signal (poor balancing between each cyl due to inadequate balance bar capabilities), TPS setup is more difficult, and in the case of our cars, no known "bolt-on" setup like the 3.2 Carrera intake.

FWIW, I am considering a custom setup using some old 911S ITB's and some custom injector blocks... $$$ permitting...

-Garen