looking over the parts that have changed on the 2016 450, wondering if they changed for durability. I see the impeller changed as well as the shift stop lever and spring. Those were both problem areas for the 250. Don't remember seeing many issues with the 450 but kind of a piece of mind thing. I replaced my shift lever last year with the newer one, is it worth changing again? Top motor mounts as well. Not sure if putting those on a '14 or '15 would change for the better seeing how a lot of other handling items were changed on the 2016. What would it take to get launch control on '14 or '15?