Ebay does not tell us much. You need to know more about the actual vendor.
Handling improvement at a minimum will be higher rate springs, firm shocks and low profile tires. That is the first step in improvement. After that is big money to get to the next level. Control arms, sway bars, quality shock absorbers, performance tires etc.
This is assuming you are starting with a car that is not already worn out like loose ball joints, steering box and worn shocks.
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