I didn’t say it was. I have never owned a Mercury. My experience has only been with Evinrude & Elto. However we did extensive propeller testing with several lower unit styles. The "through the hub exhaust" was the most extreme example I could think of. On the other hand, one of our members was selling cow horn ends to epoxy on to the front of the gearcase for a more streamlined appearance . . . 😀
