If you are looking for loud, check out the Motordyne Shockwave. Good quality exhaust that is pretty damn aggressive sounding. I have a F.I. which I think is perfect but I wasn't looking for strictly loud.
Best advice I can give to this question is post up in your regional section, head to a Z gathering, and check out some exhausts in person. Will give you a much better idea than some random youtube videos. Everyones definition of loud is different - best to just hear some stuff in person so you can form your own one.
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F.I. / K&N / 180 / Forgestar 
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