well i had a really hard time finding any good info about exhausts/headers so i said F it and went to my local muffler shop, told him to cut off from the cat back and i put a flow master 40 series on it and called it good.
the Alpha sounded damn nice with zero muffler on it before we did the install. (6 catalytic converters soften the sound a lot) it was definetly not overpowering. If you want maximum noise i would do that.
anyways made a vid of the sound:
http://www.youtube.com/watch?v=7SIpimavOX8