No Brunswick was against using anything other than a Brunswick product when they owned them. Hatteras prefers to use Cats almost exclusively, but uses MTU when it has to (above 1900 HP). I don't know their situation with using MANs, but I would think if it made a lot of sense to use them in a hull, they would strongly consider it. The MAN's would probably make a lot of sense regarding weight, fuel burn, and quietness. I ran a new set of the 1400 HP mans in a 70' Princess and it ran great, 28 knot cruise, quiet, smooth, powerful.