Exhaust Gasket - 57mm ID - E46 M3, Z3M, Z4M

This part is listed by BMW as BMW part number 18111723379 (18-11-1-723-379) and is described as Exhaust Gasket for E46 M3, Z3M, and Z4M. 

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BMW Fitments:

3 Series
E46 (99-05) > M3
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 M - S52
E36/7 / E36/8 Z3 (96-02) > Z3 M - S54
Z Series
E85 / E86 Z4 (03-08) > Z4 M