satria gti chassis and suspension is tuned from factory
and i think satria 1.3 and gti chassis is not exactly the same
so even if you use the same hardware as a satria gti, you wont get the same handling
satria R3 chassis is even better than satria gti chassis
during a corner, the load from a corner will first affect the tire, then the suspension system, than the chassis
all this 3 plays a crucial role in getting a good handling car
the superpro bushes is quite expensive, try checking at the marketplace