[tartuffe]

If you add 5' to that hull off the rear that will be one hard-pounding ****ty ride. Look under the boat and midway there is a big wide flat spot where the fuel tank rests that stays in the water at cruise. Adding five feet shifts the weight further back making that flat spot your point of entry into waves in a chop. That will beat your fillings out

Also regarding power, the boat is not made for that type of power without major modifications. Go to a boat dealership and ask to see the hull core samples of these modern 25's with twins and you'll see about 3/4" to 1-1/4" thick fiberglass layups. Our boats have nowhere near that, ours are more like 3/8".

Not trying to be a downer but because it was done before doesn't make it a good idea.