I just installed my dual exhaust today with the pypes x-pipe, gt mids, and gt takeoff mufflers. I have a vibration when I'm stopped and its idling. It only does it when the A/C is on. The x-pipe is shaking and causing the noise. My car is a 2008 so it doesn't have the transmission cross-member exhaust hangers is that the reason? The pipes have good clearance and the hangers are good. Has anyone had this problem?