There is no specific definition of hybrid. Hybrid just means its made of random turbo bits and isn't available as an off the shelf option form Garrett.
Yea I know all this was just wanting to know who's done it? What they changed and did they notice a differance?
ED you'll no doubt know this can you swap compressor housings say...a housing from one t25 from another
could you also take a compressor housing from a t2 and place it on a t25 and vice versa