A muffler or axle back will do you ZERO good in the performance department. Invest in a cat-back.
The Mugen is definitely a nice piece, but the gains are only optimal in the top end. Also stay away from Tanabe- they have a bottle neck 3 inches long less than 2.25" in diameter.
From a sound standpoint, I would look at either the GReddy SP or the Apex'i with a silencer.
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