Try doing a search for "exhaust review" and read through some threads. Different exhausts produce different results. Some sound high-pitched and exotic, while others have a deeper tone. Decide for yourself what tone you prefer and do your research based on that. YouTube vids never do the sound justice, but they can help narrow down your choices.
The Akra is a fantastic system, great build quality, and if you go with the full Evo system, you save a bunch of weight and gain a healthy amount of power. It's expensive, but nobody seems to care how much they paid after their first post-install WOT run. The ONLY gripe I've ever read in regards to the Akra is that, for some, it's too quiet.
Check out Eisenmann and Meisterschaft as well, two other popular choices.
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