TODA Racing Co., Ltd. (Japanhttp://www.todaracing.com

Japan Super GT Championships http://www.supergt.net

Japan Formula 3 Racing Series http://www.j-formula3.com

J.S.S. http://www.jss-org.com

 Honda Motor Corporation Japan  http://www.honda.co.jp

 Bridgestone Tire Corporation Japan http://www.bridgestone.co.jp

 NGK/NTK Spark Plug Corporation Japan http://www.ngkntk.co.jp

 M-TEC (Mugen) http://www.mugen-power.com