2007 Nissan Sentra Crunching/Popping Sound

Hello,

Recently, I had bought a 07 Nissan Sentra. For some reason the car will make a a crunch/scraping sound when going over bumps. The strut mounts were bad but had been replaced, but the noise is still there. It will do it a little when braking as well. The front end checks out, and the only thing that was noticed was the cv boot is torn. It will even pop when you go over a big enough bump. On normal driving it will be quiet, but will make the crunching sound once in a while. Any ideas? It also has brand new tires