Huh, no Simon , you didn't scare me .
People seem to have a mythical view that the GTR is an unbeatable all conquering thing .
Most road near stock GTR's ( pipe , boost , clutch ) are good for around 12.4 or so at the plex.
A good GTST is good for 13.4 or so. A slight lazy launch or insufficient revs on grippy tyres ( my excuse ) will negate the difference and once grip is achieved from both cars power/weight comes into play.
I also do NOT confess to being a drag expert, my satisfaction is track orientated.
Having said all that , that is a freakily quick stock terbed ( I have been told ) 32 GTST you have there.
Cheer
Ken