Well you're an enthusiastic one, aren't you?
I can answer a couple of questions for you. The first is that most people here are going to tell you that your transmission is going and that you'll need a new one soon. Is that really the case? I dunno. Can you trust any mechanic to tell you honestly what's wrong? It's doubtful. Few Subaru dealers know the transmission beyond a 'replace/leave alone' decision.
Does your 'power' light blink when you start the car?
The noise you're hearing is likely the exhaust resonator. It's welded to the center pipe. Take it to an exhaust shop and, if they determine that's the source of the noise (and not a heat shield), have them cut it out and replace it with a straight piece of pipe. That should be under $50 to do.
Good luck and congrats on your SVX! I hope it serves you well!