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I put on a full Akrapovic system and it's amazing. Loud when I want it to be and civilized when not needed. There are some for sale here on the forums and you could pick up a good system cheaper than new. Challenge is now being made by IND distribution. They are supposed to come back out with the Challenge x pipe here soon. If I didn't do a full Evo system then Challenge was going to be my second pick. Good luck with whatever you decide.
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