Few key things seperating your friends Honda from a stock Polaris. First off is the muffler. Take a look at its deisng. Hold a glass full of air upside down underwater.....air stays in the glass. The polaris muffler works the same way. Hold a glass sideways under water...air goes out..water comes in. Honda muffler for ya.

I have had many friends over the years turn their Polaris quads off in the middle of ponds and streams while we are washing them. I'm not saying to do it as I dont want anyone to get mad at me, but I am saying it is possible.