Tokico Illuminas are very nice aftermarket shocks or struts that can be easily adjusted to provide customizable handling. This is accomplished by simply popping the hood and trunk, and turning a dial on each shock. Manufactured to fit many types of sports cars, these shocks give you the ability to change your handling characteristics depending on road condition, i.e. highway, in-town or the track. The front and rear suspension can also have different settings which enables the driver to change the amount of oversteer or understeer.
Typical price for these beauties is $450-$550 for a set of four.