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I contacted Silent Rider and the woman told me they didn't make one for the 520 and probably won't. I don't know why since they make one for the 500. If enough folks inquired about one for 520s maybe will make them. The woman at Silent Rider suggested their "universal" muffler. The one for the 500s look really easy to install. The 520 would need the same muffler inverted for a proper fit.