I'm not sure if I posted about this before or not, but I remembered it yesterday when I was ordering an impeller. My boat is a 2000, but my engine is a 1999. I learned this last year when I bought an impeller and it would not fit. It's not a big deal, but I found it interesting. For most years it won't matter, but there must have been some minor changes to the 5.7 mpi between 99 and 00. I know that boat models years start around the middle of the year before, and my boat is likely an early 00 model.