Noise and vibration

I bought a 2006 Honda accord coup. It was in an accident and the front passenger side was badley damaged and rebuilt. The car runs great but when standing still and in DRIVE the car has a Brrrrr sound. Any ideas?

Honda attaches tin heat shields at several places along the exhaust system. They are spot-welded in place. They tend to come loose and can make a lot of noise as they vibrate.