Using your G8 for more then a daily driver? Upgrade your AC Tensioner to a Heavy Duty one from Holden to prevent your AC belt from jumping off causing hundreds, if not thousands of dollars worth of damage to your car. Tensioner kit comes with a brand new belt. This fits all 2008-2009 Pontiac G8s.
Price is for one (1) tensioner kit + belt
If you are using an under drive crank pulley, you will need to source your own belt since the kit belt will be the wrong size.