As I mentioned, we have been very happy with the Red Line in the racing applications and are also good with its use in street cars. The race boxes get taken apart once a year or so and we get to see how it works in tough environments. We are very happy with the product. Here are a couple of links from Red Line:
http://www.redlineoil.com/products_gearlubricants.asp?productID=38&subCategoryID=15&categoryID=6
http://www.redlineoil.com/products_gearlubricants.asp?categoryID=6
We are using the full synthetic. Again, I would think that if this is used on the street/track that a 3% friction modifier mixture might be best.