Don´t need to change, you can use a bigger pipe than needed without loss of power. The only drawback is a bit of extra weight in the tail area but you will need some lead in the nose anyway.

About using a P200 for shorter takeoffs is questionable in my opinion in this plane: The P200 needs more fuel onboard for the same flight duration of a P160 or a Rhino and this extra mass and higher wing loading make the takeoff run not much shorter, and makes the airplane feel heavier for the rest of the flight.

However, if you want to hear the sound of rushed air of the P200, forget everything I said.