Raise the car.
Measure the length of pipe section "A" at the new subsequent muffler.
Transfer the found value of dimension "A" to the pipe of the subsequent muffler installed. At this point, disconnect the pipe and clean it from burrs. Remove the subsequent muffler.
Connect the new subsequent muffler using the "arrow" compression sleeve (spare part). The joint of the exhaust pipes must be located in the middle of the tightening sleeve.
Straighten the exhaust system and the tightening sleeve so that there is a distance of at least 25 mm to the body in all areas. In addition, the end pipe must be evenly spaced from the walls of the body recess at the rear of the car.
(The original article is available on the website «BMWMAN»)