BMW part number 18211175787 (18-21-1-175-787) is a heavy-duty steel exhaust pipe clamp. It is used to secure structural mounting brackets to the mid-section piping or muffler inputs on classic M30 inline-six powered BMW models built between 1985 and 1993.
- 5 Series (E28): 1985–1988 535i and 535is
- 5 Series (E34): 1989–1993 535i
- 6 Series (E24): 1985–1989 635CSi and L6
- 7 Series (E32): 1988–1992 735i and 735iL