Noticed today the stock S50 airbox / air filter housing / intake silencer has a blank where a second mounting would be fitted as per the E36 M3 airbox so maybe the parts are identical except for this additional mount fitted to the M3. Part numbers are obviously different but the E36 M3 box is a lot easier and cheaper to find second hand.
S50 M Coupe airbox,
S50 M Coupe airbox,
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