Anything you do to it is your own. If you feel it's worth whatever gain (even a different sound), it's your money.
Back on topic, about the only thing I saw that I would consider is cam/valvetrain work. And like the above poster not so eloquently put, you'll probably want a custom tune for that. There's little things like an electric water pump if the one goes bad, but I wouldn't do it just to take draw off the engine. Take a look around the performance sites. Don't be afraid to ask redundant questions or even email a tech. I'm sure there's more than a few techs here as well. After all, the more I think I know, the less I likely do.
I'm new here too. Welcome!
Edit: It might sound backward, but the single mod that I found added the most streetable, usable performance was nothing more than upgrading brakes. That adds a very real improvement even if your 3.8's running on 5 misfiring cylinders.
