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I did the Charcoal Delete + K&N Drop-ins on both of my F10 M5's and there's a slight improvement in sound and the car seems to breathe better but HP gains are minimal IMO (some will argue this). Oiled filters were an issue in the F10 M5's due to MAFS but this should not be an issue on the F90 (no MAFS).
Simple DIY
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CURRENT: 22' INDIVIDUAL M5| CHALK | TARTUFO | CCB | MPE | H&R | IND
GONE: 19' M5C| SINGAPORE GREY| ARAGON|VELOS VLS-06|H&R|iPE|IND|XPEL|CF|RADENSO
GONE: 15' F10 M5|BSM|BLACK|VELOS VSS-S2|KW|AKRA|IND|CF |ESCORT 360|VELOS PIGGY
GONE: 13' F10 M5|SG|BLACK|AKRA|KW|IND
LONG GONE: 09' E60 M5|02' E39 M5
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