I have a 97 Maxum 20ft fish ski with a 5.7mercruiser, but we have set it up for wakeboarding. A couple weeks ago I tore my prop up a little and need to get a new one. Right now I am running a stock 3 blade wehich i beleive is a 15.5 x 18 or 19 (Hard to read the stamp. I want to go to a 4 blade since I have read that they give a better whole shot and get you on plane faster. A couple sites have recommended a 14.5 x 17 blade and Some say 14.5 x 18. I do want to stick with aluminum since I really can not afford stainless and we may be selling the boat after the season to get a V drive. I have pretty much narrowed the chioced down to mercuiser, Solas, Michigan Wheel, but Volvo makes a QL line prop that will fit a mercuiser and I can get one this weekend for just over $100. I just can not find any reviews on them. Any help guys, I promised my GF I would order by tomorrow.