The spec.B MC/BB is the same as the lgt of the same year. Do you have VDC? I'm pretty sure the '08s do, and I know by '09 does. This makes it much harder to swap in the sti MC/BB because the fittings on the hard lines are much bigger on the VDC, M10 vs M12 if I recall correctly.
Also, as far as I know, the 08+ sti actually uses the same MC as the VDC-equipped lgt, but with a stronger booster. When I have some more time available I plan to just swap to the sti BB (and avoid the fitting size issue) and see what the results are with my brembo setup.
If anyone knows if this is true, please advise.