I would advise anyone looking to buy the MP20 kit for track use to do their homework. If the spring rates are truly 40N/mm (front) and 30 N/mm (rear), the car will understeer.
I still have my Ohlins kit but they are now setting in a storage bin. These were originally with the 60 N/mm (front and rear) springs and it was pushing way too much for me. I ended up swapping to 350/425 (F/R) Eibach springs which was a big improvement. But with the stiffer rear springs, the car sat higher, even with the coilover at its lowest point.
This is the MP20 kit I presume:
http://www.roadandtrackbyohlins.com/...oyota_GT86.pdf