Chris, whatever muffler you choose, know that the swap will be for a sound enhancement, not a HP gain that one can feel.
Changing your headers will give you 15 HP though.
Whatever you buy, insure it has a money back guarantee you can use if the muffler has resonance between 2-3k. It can get very loud and give you a headache if you get a two-chamber muffler with a lot of resonance like the one I am running (DelubozParts).
I love the sound of my exhaust and much larger headers with the top down, but with the top up and windows down, the drone at 2-3k rpm, such as one would maintain while bumping along in traffic, is simply unbearable.
You'll pay a LOT more for a muffler that is advertised as having no resonance, but it's worth the money.
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