Well, not exactly sure what the "T63 Stealth" is, but the "Stealth" has a HUGE compressor wheel stuffed into a TE housing. I've got one on my "paperweight" T-Type that I bought in about '96 and it now has a whopping 58 miles on it! I disassembled it upon purchase (to port the housings) and the wheel measures like 68.5mm! I can't imagine stuffing anything bigger into that housing... doesn't appear physically possible.
It was originally designed to run in one of the BG classes that wouldn't allow any larger housing than that. It has the large shaft center section and is said to support 750 h.p. and wants a 3400 stall, or so.