Loud Engine on 2007 Pontiac G5

I am the second owner of a car that was in a front end collistion. The car is loud. It actually sounds like the RPM's are really high but, they are not. The noise "speeds up" with the aceleration of the car.

2 answers
I have a 2007 G5 and find that my engine has also sounded loud when it gets up around 3000 RPM's
Sounds like a damaged exhaust manifold, exhaust pipe or muffler system.