actually even though the crank hp humbers would be the same, the gst would have higher hp to the wheels, as the gsx is going to have more drivetrain loss. also, i think the gst fun be lots of fun on the highway.
ps- needs bigger fuel pump and cams to max out the turbo, currently i bet it could do 350ish to the wheels

 

^^^ it has a 255 lph pump... that should be plenty. and as for the cams... he actually has 272 cams in it. saw the car. it is not in very good condition. so the engine needs to sell the car for me. i am gonna try to get a lower price. gotta find out what it would cost for a full interior and front, rear, sideskirts for 97 gst...

 

Everything looks good except for relying on thethe SAFC for tuning. With aturbo that bigand 850cc injectors w/ a 255fpa SAFC isnt going to control things very well. If you do get it i would advise in getting a DSM link or a Greddy EMS.