BMW part number 18211175585 (18-21-1-175-585) is an exhaust system metal carrier bracket / holder. It is designed to support the under-car exhaust piping configuration specifically on classic E28 5-Series and E24 6-Series platforms manufactured between 1982 and 1988. This piece serves as an essential structural "holder" designed to keep the main mid-pipe or rear catalytic sections cleanly secured away from the bottom of the floorboard. Because it resides directly in the line of fire for road debris and heat cycles, it frequently suffers from deep surface scale rust or stress cracking over the decades. (gar2-Y3)
- 5 Series (E28):
- 1982–03/1987 528e (2.7L M20)
- 1983–1984 533i (3.2L M30)
- 1984–1986 524td (2.4L M21 Turbo Diesel)
- 6 Series (E24):
- 1982–1984 633CSi (3.2L M30 models built from September 1981 onward)