I was wondering if anyone could guide me into what parts would be great for putting into my new Mazda6. The more horsepower, the better.:D I'm just trying to get around 300+ hp right now.

you would have to look into forced induction or nitrous...

indeed, i know there is a company that is coming out with a turbo system for the 3.0L. I believe it is Wagner Motorsports. I have also heard of a couple of guys who have blown their motors with Nitrous-mainly because the intake manifold doesn't distribute evenly