Guys - I am going to run the BMW 735i635i535i TB. It is actually 67mm in diameter. It looks like this:
Compared to the lovely 50mm OEM L28ET TB
This TB has no taper so its 67mm all the way through...look at the TPS same Bosch Style set-up as our L28EL28ET cars - bonus!!!! Will require new holes drilled in the intake or an aluminum adapter and of course some messing with the linkage, but heck worth it!!! Not quite as huge as the 70mm Mustang units, but will flow more than enough air for in excess of 500whp.
Yasin