The one downside is ,the way the exhaust is set up, a slip on is out if the question.its full systems only, unless you find a way to do a hack job for a slip on.( don't do that) I did an m4, reasonably priced. However it is loud but sounds so good. I know graves, akrapovich and Yoshimura also have something. It really comes down to what you think sounds good, and your budget.
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