I just installed by myself a Lewmar 2.2kw as per Hunter's SOP. It is rated at 92.5 ft/lbs. It works well on my 41DS. I docked a week ago in about 24 kt wind and it really saved me. I think that the unit Hunter specs for your boat will work fine, but it can't hurt to have more thrust. On the installation on my 41DS, space was very, very tight for the tunnel. The diameter of the Lewmar tunnel is 6", I don't think it would have been possible to install a larger diameter tunnel, so the 2.2kw is the most powerful unit that would fit. I think you would need to make sure the larger unit will fit in the 45CC. I would also suggest getting from Hunter the SOP for your installation, it was very helpful on my installation.