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
BMW CCA
Mercedes-Benz Club of America
Porsche Club of America
Volkswagen Club of America