S14 LMGT4 specs:
17x9.5 +12 w/ 235/40/17
18x10.5 +15 w/ 255/35/18
Full coilover and adjustable arms, pulled stock fenders. There was probably room for more aggressive if i wanted to change the camber (before i sold the car)
I think those tire sizes are just fine for track, assuming you run a more aggressive compound than i was (at the time, FK451 which is really a daily driver tire)
my buddiess were running 17x9.5 +22 all around for track,
it depends how much power you're making too and how much tire you need