My boats a 2008 230 Wake and so much for the 08 not having ceramic washers. I will say this, I have 92 hours on the boat and there was no wear on the shaft when I checked it with a micrometer and the washers showed very little wear. I have a feeling the bigger boats aren't going to have near as many problems as the small boats or the skis. Here is some info alot of you might be interested in, now I do have a strong mechanical back round but this is the first time I've worked on a 4- tech engine. It took me 1hr and 15min start to finish on the right side engine (the first one I did) and I did left engine in 50 min start to finish, and that's with whipping down the parts as I took it apart and oilling everthing as I put it together. I hate to say it but I think the majority of shops are ripping people off, it's not that hard and if your mechanicaly inclined I don't think you will have a problem, take it apart set it on the table right to left put it back to gether left to right use a tork wrench to tork it down then check your slippige and your done. The instructions with the RIVA washers are easy to follow. This is just my two cents on this matter.