I have a 2000 Yamaha 40HP 4 Stroke outboard and I'm trying to decide whether to put another aluminum prop on it or go to a stainless steel prop. I know that the stainless props are a lot stronger than the aluminum props,but I have been told that the lower units on the Yamaha motors are not that strong and if you happen to hit something pretty solid you are apt to tear the lower unit out of the motor with a stainless prop on it. I was just wondering if anyone could give me some insight on this. Also I have a 11 1/8x13 prop on the motor now and I have been checking the net for a new prop and I'm being told that if I stay with an aluminum prop I need to stay with the same size that is on it now,but if I go with a stainless prop I can go with a smaller prop due to the way the blades on the stainless are made. Any and all advice on this matter will be taken into serious consideration. Right now I'm sitting here scratching my rear end trying to figure out what to do. PLEASE HELP!!!!!!!!! BTW,does anyone know where the most reasonable priced props are at on the internet? THANK YOU!!!!!!!!