haha cheers for this guys, i am on a budget, thats why i have shit tyres. But in the future will include front and rear swaybars since its a CXi Ek1, Subframe/ ASR, bushes, heaps of suspenison bits, then I move onto the breaks then the engine.

My proof which may not be big but i have seen it. At Mallala Raceway (near Adelaide) my dads mate races historics in his XU1 Torana gtr (full on group N i believe) and he always uses Toyos, then one day he was short on money and decided to buy second hand Yokohama tyres that were used from the Clipsal 500, and in that day, he made a whole second from them in his first round, second round he made another .3 so basically he made 1.3 seconds with Yokohamas instead if Toyos. Nothing was improved, all he did was the tyres and thats it. It maybe a softer compound than the Toyos but Yokohamas can last as much as toyos or longer, no less unless drifting and burnouts.