This Mustang belt tensioner is the same belt tensioner that's included in the 2010 ROUSHcharger kits, making it a replacement part for these packages2010 Mustang R2300 ROUSHcharger Upgrade Kit (part 420026)2010 Mustang R2300 ROUSHcharger Upgrade Kit (part 420027)2010 Mustang Chrome ROUSHcharger (part 420024)This tensioner is specially designed for heavy duty applications to handle the added rotational forces on the FEAD from supercharging. This heavy - duty tensioner is an upgrade for all SINGLE BELT TVS R2300 ROUSH superchargers installed on 2005 - 2009 Mustang GTs.