Any compliance in the swaybar bushes act to reduce the effective rate of the swaybar - this is due to the rubber squashing, allowing some body roll before the swaybar even gets to start working.
Replacing the swaybar bushes with new toyota ones will make some improvement on any 10 year old car...
Replacing the swaybar bushes with nolathene (or equivalent) will sharpen up handling more than new factory rubber bushes. This is because they squash heaps less.
Pretty cheap way of getting the best out of your swaybars.
Ewan (10k20v) will also tell you that his trueno handling also improved when he replaced the bushes on the rear suspension arms that run forward from the rear hubs (not the ones that run towards the centre of the car) using nolathene type bushes. Ask him what else he replaced.
With my Carina rwd racecar I searched for higher rate springs of the same dimensions (for carina look for cressida, supra, celica springs) at the wreckers. Also searched for higher rate swaybars (supra and celica). New KYB shocks at the front, rear... bilsteins that I found in a supra at the dump!!!
Also lots of nolathene type bushes where ever I could get replacements.
Ken
Ham
021 408 863