In the real world the duke had many problems, I used to work at garret aviation and one of the owners had a duke, it's a nice plane but you get more bang for your buck with a Cessna 340. The Continental TSIO series have a longer life span than the Lycomings that the duke was equipped with. Lycoming admitted that there were faults with running turbos on the 540, however there were some improvements made in later years.