Beginning in 2004, DENSO has supported the Subaru World Rally Team as a corporate sponsor in the FIA World Rally Championship (WRC). The Subaru World Rally Team will continue to use DENSO Spark Plugs and Sensors for the Engine Management System of the WRC car. The Subaru Impreza WRC has a DENSO Iridium Spark Plug installed, a plug which was specifically designed for the WRC car and has the same basic structure as the DENSO Iridium Racing Spark Plug - which is known for its extremely thin iridium alloy center electrodes. The electrodes ensure excellent ignition performance, leading to fewer misfires, improved acceleration, and smoother driving. Also, using platinum alloy on the whole ground electrode means fracture and wear is reduced even under severe driving conditions like races and rallies, while the strength and durability is increased compared to normal plugs.