Since i have put 4 x Dunlop SP9000 my IS200 it seems all over the place, i have had a four wheel alignment done and still no different. It get worse if is windy and then it seriously a mission to handle the car.

Can anyone help or give me some idea about what is causing it?

check the tyre pressures

Sorry, but those Dunlops might be at fault.

when i had f1's on i tramlined loads

as they are standard fitment and no one has really compained about this before i doubt it - unlesss the set he managed to get were dodgy.

Well i have checked the tyre pressures, and had another comapny check the tyres and they all seem ok.

one thought - there are different load ratings available and there is one specific for lexus as it has a higher rating - whats the load rating of yours???

jus a thought mate but if all tyres are the correct speed and load rating then try swapin the fron 2 wheels from left to right?!?

then he would have to get them taken off the rims and put back on again as the tyres are directional