I don't believe any of the new Gs will do 40+ without repropping them. They are all a 17x17 prop with a 2:1 gearbox now. My '15 G21 w/409 topped out at 38, and my 2016 G23 with 550 tops out at 38 as well.
reprop isn't necessarily a big deal, however, I have tried a 17x18 and a 17x19 on my 2016 G23 (trying to get surf and wake RPMs down because it is way overpowered on the low end and would like to burn less fuel and not listen to the engine running as high rpms). Problem is, both of those props dirtied up the starboard wave. I have no idea why....
We played with weight, speed, and NSS/NCRS settings and finally got it fairly decent, but it is way too finicky. In stock form, it is as simple as loading level, and hitting the throttle. I have no idea why the props make that much difference, but I had to go back to stock. Port wave was unchanged, but starboard was crap. I was baffled, but it looks like I will live with the 17x17.
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