Based on the experience from the operation of the airplanes, the airplane manufacturer allows the installation of modified exhaust pipelines Dwg. No. E6 18-23 01, E6 18-24 01, E6 18-25 01, E6 18-26 01. A major benefit, leading to increased life of the exhaust system, is to increase the wall thickness at the location of the ball joint where the original version has a wall thickness of approximately 0.4 mm and the modified version has thickness 1 mm.