[NoHachi]

The suspension motion ratio's change and the unsprung weight does as well. Those are mayor influences on the required spring rate and damping curve.
So depending on how big the change in those variables is, it might not be usefull to stick to stock dampers. You might have better luck with S13 stuff.

Switching from TRD to real shocks will nett you 2 secs per lap and easier driveability. Take a look at what the front runners use in Japan. Even TRD doesn't use their commercial stuff.