Seems to me one large single turbo under a Z32 hood would be a large pain in the butt and a plumbing nightmare.......Possible, but is it really desirable? Seems to me the Z32 guys have been doing well for years upgrading to a bigger TT setup, and for certain a tried and true TT upgrade would be cheaper than a brand new single turbo upgrade setup. Somebody check and post prices, but I bet the differences are huge. Going to a larger single turbo is NOT always cheaper, especially in a car with a tight underhood space like a Z32. We all know how expensive Lingenfelters TT setup was for the Corvette, another car with little extra space under the hood.........
Besides, I don't see a larger single turbo being very desirable for the road course guys, which comprises 90% of all Z32 owners. Only the few dragster guys would buy something like this.