Brad,
the spring rates and shock valving (and anti-roll bars) that you want for autocross will be fairly different than you want for a solo1/road race car. The transitions in soloII tend to be quite a bit faster than in SoloI/RR. You might have to make some compromises. When I am looking for VW information I call Shine Racing in Walpole MA. I drive one on the street (91 GTI 16v) and have autocrossed it and done soloI with it, and they have been an invaluable source for me. They also have great customer service and are stand up guys.

Eric
NER SM #02