We've owned this boat for about a year and we are hooked on wake surfing. So I've been making some improvements and have ambitions to do more. Who doesn't like a project, anyway...   Last summer I added 2 more hard tanks in the back on top of the stock hard tanks. Probably should have went with Enzo sacs but would have to fab a better enclosure for those. Additional hard tanks were easier at the time. Also added a bow bag (with vent and a drain pump) and another pump to fill it and the bag we put on the back seats.   The extra hard tanks are plumbed in parallel with the stock tanks. I added dedicated drain pumps to the new tanks this spring so they would drain quicker.