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You wont notice hardly anything w/ just a +1mm unless you are doing a lot more engine mods. There is some benefit, but not much, in performance wise and with an everyday rider that isn't doing this for a living, you probably wouldn't notice much at all. This is coming b/c I am going thru all of this right now. I am doing the 730 kit, stage 2 cam, and redoing all the valve seats, and after checking data, there isn't much difference btwn valves (coming from Dyno sheets for 450s which I know is a completely different machine, but it can't be much difference). The only thing you're doing that I haven't looked into that much is the throttle body.
 
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