I went with an RK-TEK head as well on my 18 300. The bike runs much better with it now. Before it was a little finicky with jetting and had some slight detonation here and there. The bike sounds different now. Super crisp.
I don't have the CDI remap done yet but plan to get it done. It feels like it added a little boost from bottom to top. I can run third where I used to downshift to 2nd. It revs out better now as well.
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2018 XC300
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