Sure sounds like an exhaust leak to me. You might get lucky just snugging up all the bolts. But, if I were a betting man. I'd look for your leak where the pipe meets the manifold.
...and don't forget, gentlemen. The best way to celebrate your day is to scrub skunk off your dog in the middle of the night while listening to your wife and teen daughter complain about how bad it stinks. At least I'll be going to see Ghostbusters this evening at my local Regal Cinema!