I got in my frist accident yesterday (not my fault) and most of the damage is just body damage. The exhaust and frame was untouched. But today, on my way to work, the exhaust sounded loud and I noticed a big power loss. The noise dies down at higher RPMS and it only sounds horrible when lugging the engine or in a low RPM/higher gear.

It sounds like an exhaust leak and sounds right near where the catalytic converter is. I just checked the bolts and converter and everything is tight enough and I don't see an apparent cracks or leaks.

Any ideas what might be happening? I may run some seafoam through it later to see where the smoke comes from.

 

I think this thread can be locked up. I ran some seafoam through it and found my leak. It's such a big leak seafoam is dripping from the exhaust.

 

the crash shock can cause any weak pts. in the system to fracture as you found out.
thread locked as you requested