a couple years ago I was sitting at the Kings river with some family and friends and we were complaining about all the pwc's, but then we decided if we can't beat them join them, so that week we all went out and bought stand-ups. It was a blast and I learned quite a bit about them... Here's what I learned... if a ski sits for two long without running you're almost definately going to loose the bottom end because the moisture causes the needles bearings to rust, also ebay is a great source for parts. Those tanks you have are most likely the water box, essentially it's the muffler and aftermarket ones tend to make your ski a lot louder.