Ultimate Performance supercharger belt wrap kit and 3 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

Easy install


The UPD high performance M113K 3 piece idler set will replace your stock plastic double idler pulley assemble and tensioner pulley 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.

Kit includes belt wrap kit with belt idler pulley and all hardware , plus the coveted 3 piece idler kit that is driven by the supercharger belt. All in one big bundle price package!

Fits all years of m113k Kompressor engine and includes G55 wagon from 2005-2011.