2 weird questions

[LX-biker]

Hi ALL BMW fans!
I have, leasing 2004 BMW 325XI. Past few month I notice 2 things, which make me fill uncomfortable on this entry luxury car.

1. During highway driving 95-105 km/hr I notice some nerve-racking whining sound, somewhat like bad gear in the transmission or drive traine. I was in the dealership and they said it is normal intake sound for 6 inline engine.... It's intake resonant noise and some cars have one more, and some less!!!??? That is some kind of answer I like to hear from BMW!
2. Windshield glass almost become freaked like other cars with 300k mileage. My have only 30 K km. Is the windshield glass made from cheese?

Please serious comments and suggestions!