Originally Posted by
Reedy
Was the understeer occuring on turn in, mid corner or under power on exit?
KU36 tyres are good. What tyre pressures were you running?
A rear swaybar will make a huge difference. It will fix the terminal understeer on turn in and mid corner, but won't fix the corner exit understeer. To fix that you need to upgrade your front diff and even that only goes so far, it's something that can't really be eliminated entirely in a FWD car.
Don't bother with the front swaybar unless you get a full coilover setup to match it.