The stainless prop is the best mod you can do - the prop you need is a Solas Yb-Sc-I-14.5/18
Labour to change should be circa 1hr, 2 hrs tops. It 4 x 10mm bolts out the pump and 2 x where the bump bolts upmto the hull. The rear pump, prop and shaft them slide out in one. You need an impeller removal tool (comes with prop) and a long bar to remove the old Ali (green in colour) prop. The slide on the new one, hand tighten and refit pimples above. Make sure you reattached the cooling lines on the pump housing. Job done.
With the Stainless prop the cavitation and vibration are virtually gone, should be good for a few mph top end and get there quicker. The biggest difference is the lack of vibration.
Best place in the UK to get one (and have it fitted if required) is Loki customs:
Speak to John.