Definatly no ported tracks on water. Could run my 02 summit all day on water. Sank my 06 summit after about 150', good thing skis made it up on the river bank, water was about 8' deep. Won't try the XP as the track holes are even bigger. It's a blast if your track is not ported. Oh ya, rough water is only good for sinking sleds.......stay clear of your buddies.:d