Tokico Illuminas 5-way adjustable strut cartridges
For racing, Mo Moscovitz sets his to a level 3 in the front, and a level 5 in the rear, while I prefer a level 5 in the front, and level 4 in the rear. So you can see that it is very much user preferenced! I believe that a stiff front end reduces oversteer while Mo insists that a stiff rear end will reduce oversteer. He might be correct, and while autocrossing, I observe less oversteer with the front end stiffer than the rear.
Here's the catch about these beauties: I bought my car with a blown engine for $350, and it was
equipped with a set of Illuminas, and I did not realize it until I got the car back on the road 6