I put in a gtp DIC from a 98-02into an 03 with no issues. It works fine. The only thing that I did not do was rewire the trac light to work for the GT as the light is always on when in a GT.
Hmm, It would be neat if there was some way to connect the TPS readout to the Boost Gauge Not to act like you have a SC but to see the throttle level.
99 Grand Prix SE-Blue CAI, 3.03 GR Transmission, U Bend Delete.
time to call the exterminator