The UPD high performance M156 5 piece idler set will completely replace your stock plastic idler pulleys with a high quality CNC billet aluminum machined performance pulley set. High quality Nachi bearings are used and only double bearings seals are used to protect bearings from heat and dirt. All of these billet performance idlers have a ultra hard anodized coating. 5 axis CNC machined for precise quality and made in USA

-CNC Billet hard anodized coated *ZZ rated high speed Nachi bearings
-Smooth quiet running * Easy install
-Made in USA and highest quality available

Replace your idlers with UPD`s performance idler set today, as the stock AMG plastic idlers, with rubber bearing seals, are known to fail from the high heat and dirty conditions under the hood. Any car with over 100k miles should replace the stock plastic pulleys. Preventative maintenance will save you the time, money, and headaches in the long run!

*Professional installation required