Originally Posted by singularity
That's a factory defect which BMW said could have a bad effect on performance. The problem of a 'whistle' sound when under throttle also disappeared after this got fixed. I've mentioned it several times already, but nobody read it it seems.
You guys should all take your cars to your service and have those holes covered with the replacement from BMW.
Why those holes were made in the first place and why exactly it was a recall is beyond me.
There is no recall in the US. Did you notice any performance change after you closed the holes?