I called Downing Atlanta the other day to confirm or deny the existence, or future existence of their SC kit for the E30. Talked to Jim Goodroe himself, who is the SC guy there.
He told me the SC kit is a NO GO, due to a supercharger vendor (not Eaton, don't remember what company he referenced) no longer supplying units. DASC would have to re-tool and charge ALOT more, so they made a business decision to give it up.
Too bad. I was looking forward to it.