Amateur Racing

SF Region of the SCCA
Golden Gate Region of the PCA
Northern California Racing Club (NCRC)

Professional Racing

Porsche Motorsports North America
Official Formula-1 site
Official BMW-Williams F1 site
Official Ferrari F1 site
Official McLaren – Mercedes F1 site

Car Makers

Audi of America
BMW of North America
Mercedes Benz USA
Porsche Cars North America
Volkswagen of America

Car Club

Audi Club North America
Mercedes-Benz Club of America
Porsche Club of America
Volkswagen Club of America