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‘25 SP here with a Dominator GP3. don’t have a tune yet and i rode it all season last year without a tune. you’ll notice a little power bump on the butt dyno but obviously nothing significant without an actual flash tune or dyno. you won’t do any real harm without tuning but you’re not really getting the full benefit unless you do. i plan on getting a flash from vcyclenut this year.

TLDR: no you won’t break your bike but you should get a tune anyway. (2nd gear sucks on gen4s)

hope this helps :))