If the Galant GSX manifold is the same as a NA 1g manifold then there a few minor differences I've found. On the non-turbo manifold the two long studs where the throttle body bolts on are in the two holes furthest from the firewall. There is no port for a BOV vacuum line. The port where the PCV hose goes is pressed in, not threaded in.
To run one on a turbo car would require drilling and tapping a spot for the BOV vacuum source.
Edit: Oh, I just remembered, the studs to mount the throttle body are shorter than the turbo manifolds. So, the throttle body may or may not go on. Not sure on that one.