I was looking at images of the SkyCourier shown below
and i have noticed the asymmetrical exhaust pipes in both engines (one pointing up and one is straight), doing my research on the internet, i found that it is used to take advantage of the Coanda effect and the flaps so that the gas moves from the top side of the wing and then gets deflected downward for a high lift effect in takeoff...
Yet i believe you can get the same effect if the gases were vectored under the wing and made hit the flaps, so why would they vector the gases above the wing, and why the second exhaust is not deflected upward ?