I recently purchased a 2003 BMW Z4 and noticed that the previous owner had blocked off the large hose as shown in the picture. I would appreciate it if anyone can explain what connection this may be and what was possibly removed. Thanks
https://photos.app.goo.gl/nYWMp5FZc96zpge68
https://photos.app.goo.gl/nYWMp5FZc96zpge68