All DSMs understeer from the factory. This is a natural consequence of using a FWD platform, since even the AWD cars were based on the FWD chassis. Understeer is generally considered 'safer' for the average driver, but can be a real pain for the advanced street or race driver.
Running a sway bar in the rear along with softening the front suspension and tightening the rear seems to help.
Fortunately, many vendors offer suspension upgrades for DSMs. With judicious tuning (possibly with the help of a FAQ page from the Calgary Area DSM site (mirrored here), the understeer can be reduced or eliminated.
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