My current tyres (FK452 front, ze912 rear) are nearing minimum tread depth and I have a track day booked, thinking of getting the new fk453's all round, anyone with personal experience of these on an S15?
From what Iv'e read they are the upgrade for the 452's only difference is they are multi directional. If you go to the track a bit I would say look at the Azenis RT615's.