Yes.  The QuietTorque systems are designed for easy installation. It is not necessary to haul out to make the conversion. The smaller units are less than 60lbs and the mid-range systems are about 130lbs.  The larger liquid cooled systems  to 180 to 220lbs and you would be wise to do them out of the water as you would want to upgrade the through hulls at the same time.  Most systems use the existing shaft and propeller.  You may wish to have the shaft, packing gland, and cutlass bearing checked and replaced if worn.  We will provide the right reduction ratio to match the motor’s available torque to your propeller.