I have silbers turbo on my 18. Idles at 22 to 24, when riding 27 to 28. Took the turbo off idle went down. Put the turbo back on idle went up. It's a silber issue for sure. No doubts in my mind anymore.
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Mine did the exact same thing. Rode last year stock, normal idle. Started it up this fall before I put the turbo on and still normal. Installed Silber turbo, high idle just like you said above. 2018 Mountain Cat.