I have a query regarding your first diffuser, the M5 one. I tried fitting one of these yesterday on my 520d M-Sport and found that the holes at the very bottom of the new diffuser do not line up with any holes underneath the car. It seemed that the panel behind the bumper needs to be removed to accommodate the new diffuser. Is this the case? Maybe the 540 is different to the 520d in this area.
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