Brent, I have 6 liter 200 SN that came standard with a 654 12.5X15 ACME. For general slalom skiing and tricks outside of tournaments I have been running two props that substancially bring RPMs down at slalom speeds. One is a 13X15.5 OJ the other is a 422 ACME 12.5X15.5 (this is what came stock on 5.7 196 and 206 Nautiques). These props I would not try and pull 35mph jumping with , it would work but!!!. The OJ runs 3620 @ 34mph with three people in the boat and a 170 pound skier running 28-35 off. The 422 Acme slightly higher, This prop I have run over 49mph with. I do not have any experiance with the 5.7 200 SN but do know some one that has played around with a few different wheel setups and he does not run the standard prop on his boat.  I have found that at about 50 hours the boat really freed up and picked up about a mile per hour on top end. My last oil change I used Royal Purple and found a little more HP. I now have 130 hours on the boat. As for refinments in 2011. All boat companys strive for better build procedures and better fit and finnish the second year of production. What I know was on the hit list is ski locker hindges, more user friendly motor box , different propping. The one I bang on them about is offering a teak platform!!! PLEASE!!!!! Art is bringing My Closed bow from Nationals next week as it was a display boat looking forward to tweaking and tuning!!!