Just as a matter of maintenance I install new shocks every year. The Bilsteins are lower cost so this does not hurt as much and is a way lower cost compared to tires.

Thought I would post a correction sheet for handling problems too. I have posted it many times before but it is easy to forget what to do when your car is not right.

Understeer Corrections

Front Suspension Rear Suspension
Softer front springs Stiffer rear springs
Thinner or no front sway bar Rear sway bar or a thicker one
Raise front tire pressure Lower rear tire pressure
Softer front shocks Stiffer rear shocks
More negative front camber More positive rear camber
Remove weight from the front Add weight to the rear
More down force in the front Less down force in the rear
Wider tires in the front Narrower tires in the rear

Oversteer Corrections

Front Suspension Rear Suspension
Stiffer front springs Softer rear springs
Front sway bar or a thicker one Thinner or no rear sway bar
Lower front tire pressure Higher rear tire pressure
More positive front camber More negative rear camber
Add weight to the front Remove weight from the rear
Less down force in the front More down force in the rear
Narrower tires in the front Wider Tires in the rear
Stiffer front shocks Softer rear shocks

Well for some reason the word spacing got all screwed up. but you get the idea.