I do have an exhaust leak, but it is at the collector, and a different noise. I know that one. This is only when accelerating and it sounds like its coming from inside the dash, right above my left knee. Its really weird.
So, update. With my radio off, I can hear a squealing rubber kind of noise when I accelerate and brake. I think one of my motor mounts is either going bad or just old. Either way, i'm not sure if that would make the noise I have been hearing. Its only on the driver side of the car. It all started shortly after I got my subframe connectors installed.