Check the listing for details. 2003 - 2007 UPD M113K AMG Mercedes Belt Wrap Kit E55, CLS55, Sl55, CL55, S55, G. Condition: New. Listed at 385.00 USD. Ultimate Performance supercharger belt wrap kit. 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 bracketsreduces slip and improves boost from 1-2.5 PSIultra high quality and on the market longer than any other kiton the market for 10 years now!Increases tune abilityPlease provide crank and SC pulley size to get correct belt sizeEasy installBelt with this kit is sized for oem specs or 83mm supercharger pulley to stock 90mm. If you have other mods to your pulleys, let us know so we can size the correct belt.