Idk, but i couldn't really on a turbo thats custom. Heard 2 many bad things on turboed Gt's. Som eppl made it, and its good, others didn't.
If i were you i would consider the SDS. Power gain i think is better than turbo, and there is no lag.
Its easier to install, and takes less space.
Ripp mods makes very good SDS's for gt's.
So far, only gs/rs have good turbo's.
Ask Rulez, he got a turboed GT