Broken Headpipe Or Loosened?
 

i got my 07 Cobalt SS stuck in some boggy stuff on the edge of my brothers' driveway. In the process of freeing it, the wheels spun kind of hard. When I got out on the road, the exhaust sounded loud and 'whistly'. I was told that these engines have a crappy mount system and it allows the engine to bounce around hard in situations like this. My question is have I broken or loosened the header/headpipe/catalytic converter assembly? If just loosened, can it be tightened back up? if it is broken, who makes a replacement other than the $500 replacement from GM?

thanks for the info in advance.