I have a 1995 20hp mariner on a 14" aluminum, It has the stock 13P prop that came with the motor. The operating ranger is 5500-6000rpm, Iam getting about 5600rpm with just me and a full tank (25L) in the boat and about 45km/h when trimmed out on flat water, The prop is 13 years old and has a few very small nicks in it that have been touched up by a shop and it shows its age, it is not smooth at all as a new painted prop would be. Iam wondering if I will see a noticable change if I go to an aftermarket prop either a Solas Amita, or a Michigan Wheel vortex those are the two that come up on Iboats prop finder which is probobly where I will order from. I would probobly drop down to a 12P prop as well, but mainly just wondering if I will see any significant changes with a newer prop? Is there is a certain brand that is recomended for this type of boat/motor setup? Just recreational boating, getting to fishing holes, and enjoying being out on the water.