These kits upgrade the spring loaded cam chain tensioners of Twin Cam engines in 1999-2006 Touring, 1999-2005 Dyna and 2000-2006 Softail to the hydraulic design introduced on the 2006 Dyna. Kits for 1999-2001 models with the stock cam position sensor function use the stock front silent chain and sprocket. Use the kit for 2002-2006 models when you have upgraded to a performance ignition that does not use the cam position sensor. Kits for 2002-2006 Softail, 2002-2006 Touring and 2002-2005 Dyna include a single row front roller chain and sprocket. Kits come complete with S&S billet aluminum cam plate, S&S hydraulic cam chain tensioners and your choice of Zodiac TPD "Super Pump" or S&S TC3 oil pump, which reduces operating temperature of bearings to improve bearing life. Note: Proper installation requires the separate purchase of model-specific additional items as listed below.