What was found
(CAN) COPILOT'S WINDOW DAMAGED BY HEAT FROM EXHAUST STACK. SUSPECT THIS CONDITION CAUSED BY PROPELLER IN THE FEATHERED POSITION AND AIRCRAFT NOT TURNED INTO THE WIND. AIRCRAFT RECENTLY HAD ROM AIR KIT INSTALLED STC SA4723NM AND LOW DRAG EXHAUST ASSY IAW STC SA00046SE. IT APPEARS UNDER RIGHT CONDITION, PROPS IN FEATHER AND TAIL WIND EXHAUST HEAT CAN DAMAGE WINDOW ON RT SIDE.