I talked to an AEM rep, said that I will be fine using the non-wasted spark ignition with the 30-1101 NA EMS. Decided to drop the money on an AEM to make my Lexus work.
Supra (twin 88mm turbos):
http://www.turbobuick.com/forums/turbo-videos-picture-library/264987-update-427-lsx-tiwn-turbo-93-supra.html
106mm turbo:
A single turbo 2JZ is easy to work on.
Do you have a line for a car or are you purely speculating at this point?
I'm not sure that there's much of a demand for something like this. IS300 owners are fairly methodical with their modifications (NA-T, GTE swap).
It's a good thought, but I don't see there being enough of a market to make this extremely lucrative.