Ultimate Performance supercharger belt wrap kit and 5 piece idler kit bundle. The perfect package to add power from preventing belt slip and protecting your ride form the dreaded stock idler pulley failure .  Designed to stop the slipping of the belt under boost pressure to maintain maximum boost under full throttle and brace the weak factory double idlers, that are known to fail. Specs:

• Prevents loss of boost under full throttle , thus increasing power equally across the power band. 
• Easier and consistent tuning Increases belt wrap on both crank and supercharger pulleys 
• Kit comes with instructions, all hardware, 1 idler pulley and brackets
• reduces slip and improves boost from 1-2.5 PSI
• ultra high quality and on the market longer than any other kit
• on the market for 10 years now!
• Increases tune ability
• Please provide crank pulley size to get correct belt size
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• Easy install

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• The UPD high performance M113K 5 piece idler set will replace ALL your stock plastic/metal double idler pulley assembly, supercharger  tensioner pulley, serpentine tensioner idler and serpentine idler  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 our billet performance idlers have a ultra hard anodized coating.

  •  CNC billet aluminum with hard anodized coating 
  •  ZZ rated high speed Nachi bearings 
  •  Smooth and 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 idler`s, with rubber bearing seals,are known to fail from the high heat and dirty conditions under the hood.