[94_AcCoRd_EX]

A free flowing exhaust isn't necessarily proportional to how much sound it makes. You say you want the loudest and you want the most hp. What's more important?

I think you should get a quality Greddy, Apexi, etc. unit. They will be fairly loud, but the sound is deep and not raspy at all.

For performance, you'll want a full cat-back setup, meaning that it replaces everything behind the catalytic converter. This will probably run a little over $500.