Since 2004, DENSO (Japan) has been supporting the SUBARU World Rally Team as spark plug supplier. DENSO also supports the team as a sponsor with the aim of victory for the team. The Iridium spark plugs that DENSO supplies are the ones made with its cutting-edge technology exclusively developed for SUBARU IMPREZA WRC2006.

The 2007 rally season started in Monte-Carlo, Monaco on 18 January and will continue for 16 rounds at locations all over the world.