Made the modification to exhaust pipe to fit the cowling. The cut was in 3 parts. Cut away the welds. Cut the lower half of the pipe. Removing that section allows the final cutting of the upper section. The fit was fine but the support clamp had gaps and I did not not like the firmness of the fit as it clamps over the half shroud. I fashioned a piece of metal to fit the other half and make a smooth complete circle. The support stack fits fine.