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Mine was pretty beaten up so I order a new replacment from my dealer. Got it today and it's gray color. Instead of red now. Also it dosnt have that metal mesh around it anymore. They said it's the new design. Did they give me some weird one or has it changed? It does have nismo branded on it though.
You can also clean them with a K&N cleaning kit. Just let them dry well and don't oil them. I wouldn't replace them unless they were damaged....too expensive to be doing that.