Glad to hear it! My own personal experience with the 3.0L, (one mine, the other my dad's) was that with two adults they do great. 3-4 adults, they struggle. Add some kids to the mix, and you are constantly having to decide who stays on the dock this trip so that someone can ski, or tube. My '88 Four Winns 160 with 5 people in it would not get on plane to save its life. And that is a smaller, lighter boat than yours. Same story for dad's old '89 Winner 17'. That 3.0 would not pull a greasy string out of a cat's butt. It struggled to get on plane with two adults in it, so you could forget it with four adults in it and two kids on a tube! I know neither one of those is exactly identical to yours, but I still find it hard to believe that a 19-21' bowrider can do much with a 3.0L 4-banger in it. Bayliner has always seemed to me to be either underpowered, or just barely adequately powered with the standard engine installed, but I know they offered some bigger powerplants. I just rarely see those on my local lakes and rivers. But that's just me...I think 400hp is just barely adequate for a Mustang.
My point was, and it has been restated many times by others, that he will most likely be looking for something bigger and more powerful soon, and not to sink too much money into it. That's all. Don't get your pantyliner...I mean Bayliner...in a wad.