Lengthen the life of your turbo and prevent sticking vanes with this drop in Upgraded Billet Unison Ring from KC Turbos for your Powerstroke or Duramax. This is an upgraded unison ring made to prevent sticky vanes and improve the functionality of your VGT turbo. This unison ring is made of billet stainless steel and is made to resist corrosion. This ring is just slightly larger than stock to reduce problem with the amount of slop that the stock unison ring has. No modifications needed and will drop right in.