This was an option for the S15 when new.
These parts have done 8k km in Japan and 3.5k miles in the UK.
Front and Rear spring rates are 3kg and 3.2kg up from 2.2kg and 2.4kg.
That doesn't sound much but the damping forces are increased considerably, this suspension feels pretty stiff and it feels very stable at high speeds - good for the track.
Also the ride height is reduced by 20mm all round (30mm if fitted to S14).
I'll also throw in my old top mounts and bump stops if required so they can be built up before your suspension is removed.
I'm looking for £275 plus delivery
If you are going to JAE you can a) meet me there, or b) if I don't make it I live down the road in Northampton so they can be picked up.