For most intents and purposes it is a subjective, cosmetic decision. I like 'em on Turbos, but not on other models. As for stability - I frequently had my '78 Targa over 145 and never felt any instability. Maybe it was the alcohol! I have not had my present '87 cab over 100, and it was stable enough when I got there. I have been told there is quantitative data to substantiate that there is more down force at speeds as low as 60 MPH with a tail, so if you use your P Car competitively there is a reason to have one. Other than that it is a matter of taste.
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wdarner@mysun.com
http://www.myjahlove.com
[This message has been edited by wdarner (edited 07-31-2001).]