I've been noticing this a couple days now and not sure why it started happening. Everything is stock, I've haven't been messing with anything. but the sound is starting to turn into a cheap Pep Boys exhaust. It got more raspier is best i can describe it. What do you guys think might be the cause of this? a leak somewhere?

Most likely a leak, my money is on a flange rusting out. Most common one to go is the last one just before the muffler.

the flange does look pretty bad from what i saw underneath.

Mine went right there as lost notes. Also, take a magnet to the bottom of the CATS. If you can hear metal dragging around the inside when you move the magnet, you are going to have a bad time.

Have a muffler shop check out your exhaust system. With you car running on they're rack they can easily determine what issues you have....Gary