A hot favourite on the modification survey is suspension.  Here are a number of detailed descriptions of what 964 owners have done to improve handling and reduce that understeer!

Check out these three articles from Adrian Streather on his 1989 C4 Suspension Upgrade and his Story of Unscientific Tyre Testing.
Wheels and Tyres for the 964.  Adrian's History and Specifications!  Adobe PDF format (79k)

Bill Gregory has upgrade his C2 to 964RS suspension specs.  The first stage was to install an RS Spec Front Swaybar.  This is 24mm diameter compared to the stock bar's 20mm diameter.  Bill gives full parts details and fitting instructions in his Swaybar Upgrade article.  Bill's second article describes his Carrera RS suspension upgrade using Porsche parts.  Observations and photos for your delectation.

Jeff Curtis has just lowered his stunning Grand Prix White 964.  Full instructions with tips, warnings and pictures may be found in his 'SUV 4x4 Conversion' article.

John Kerr Replaces his 964 Steering Rack Gaiters using a method for that does not disturb the tracking settings - with no special tools.