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I did my own shaft mod to my V-Max, and yes it made a big improvement. So much so, I have been driving Rhino nut's dialing in the tune. Maybe it's more sensitive with my cam / bolt on set up but it for sure needed to be re-tuned. I'm shocked that no else has reported needing a tune adjustment. I will do an A/B comparison when I get on the dyno soon.
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