How's the flex joint? I know mine disintegrated in spectacular fashion recently. It started off as a mild exhaust leak sound and grew ever so slightly louder over the course of about 1000-1500 miles. Then one day it let loose entirely and all the while I did notice a slight performance decrease as it got louder. Now that it's fixed it feels like a new car. Heck, I even sold the Monte SS because I knew I'd be driving the GTP every time now.