Well... I finally did it. I've been kind of anxious about the whole "modifying my car" because I've never done it before, and my car is still under warranty. I have no idea what this might mean for the warranty, but after hearing / feeling the difference, I don't regret it one bit. I love it!
Just two modifications for this round:
I went to a place called Rick's Muffler, and for $650.00, they installed both the mufflers and the x-pipe.
That's including the hardware.
So, Rick's Muffler bought and installed the mufflers and the x-pipe for $650.00, which upon calling around, I came to understand is quite cheap.
So far, so good. I'd recommend Rick's Muffler. Time will tell, though.
Oh yeah... I've included an audio of the difference before and after the upgrade, and a couple of pics, as well.