kei office vs. silkroad

[axiomatik]

If you really want stiffer spring rates, consider Tanabe Sevens, they're spring rate is 10/8. They probably won't be much more expensive than a set of silkroads with custom spring rates. However, for daily driving, I would think twice about that high of a spring rate. Just upgrading to coilovers will greatly reduce body roll, and if afterwards you still think there is too much roll, get larger sway bars, which will allow you to reduce roll without hurting ride comfort. As mentioned above, spring rate cannot be changed without swapping out the springs for a different set. Coilovers are damping adjustable.