Fits like a glove and reduces the belt squeak I had with the stock belt. The G8 GT is notorious for its wobbly balancer and this belt, thanks to its cross ribs, wobbles side to side enough to reduce vibration. Great upgrade. Paired with a new tensioner (http://www.amazon.com/gp/product/B0049Z4TTA/ref=cm_cr_ryp_prd_ttl_sol_15) when replacing the water pump. Couldn't be happier.