ok have just done front and rear shocks and springs also front sway bar link rods has improved heaps but it still has understeer going around tight corner 40 50 kph corners fast what can i change to fix this will new cater help ?

I would be looking at the camber of the front tyres and see if you can get that changed, im also guessing that the spring rate and shock selection might not be the best. I personally would have used a set of koni adjustables and a set of springs rated to to suit the intended application. If your circuit racing then this is where the time and research comes in. i would also look at a strut brace across the front strut towers to keep it all togther and provide some strength. The vt front camber was shocking and always needed attention good luck mate hope it helps