A strut brace contributes significantly to the stiffness of the front suspension mounts, preventling flexing of the strut towers under severe load. Even in mild road use the fitment of a strut brace can be felt in the handling of the car. Of particular benefit on cabriolets and Targas to minimise scuttle shake.

Yes. Although not designed for bush replacement - Porsche advocate the complete replacement of the wishbone - there are replacement bushes available from PowerFlex who also make ARB bushes too. Replacing the wishbone bushes is not so simple to do due to the original design - exisiting bushes have to be cut out making it a more labour intensive job than just a wishbone change. A full geometry check/adjust is advised after changing the wishbone and/or bushes.

The standard Boge shock absorber struts have a degree of adjustment but it's only really designed for corner balancing, not ride height adjustment. To lower the car by any significant amount requires the springs to be changed. There are springs available from many manufacturers, the most popular being Eibach and H&R. Eibach springs offer up to a 30mm reduction in ride height, H&R offer 40mm with their Green kit and 30mm with the Red kit. Bear in mind that the H&R Red kit is primarily designed for the Turbo II and may be a litle harsh for the standard C2/C4.

No, you can buy refurbished wishbones by Hartech, or you could have Powerflex bushes fitted amongst others.

You may have a pre-1991 car, the fittings for them changed and are longer in the 91 and on models.