I have owned lots of wrx's
A stock MY97-MY00 will do a dead 14 second quater mile at about 98mph
A stock MY01 will do a 14.2 at about 96mph (I know this from experience)
--See...the so called slow rex isn't so slow at all.
A stock MY02 will be a touch quicker as it has ower gear ratios (never owned one though)
A stock MY03 will also run a dead 14 at about 100mph (know heaps of people who have run this)
A My97-MY00 all standard except exhast will run a 13.7-13.8
The quickest I have seen a MY97-my00 run with stabdard turbo is about 13.2-13.3
I now have a MY00 STI. Only mods are a power FC and exhaust. Even running standard boost. It runs consistent 12.60s @ 111mph.
If I could get traction, I should be able to run a 12.3-12.4, as I have run a 12.6 with a 2.0 sec 60ft.
Correct me if I'm wrong, but the best quater you will ever get in a stock R33 GTST is about 14.5 at about 98mph