Regarding noise levels Audi Q5 vs BMW X5:
2015 Audi Q5 TDI 70dB
2014 BMW X5 35i 66dB
Just to explain what that difference means: 10dB difference is twice the level of noise. 4dB difference like we have in this case is a very noticeable difference (Audi in cabin noise level sucks probably because it's a diesel, I bet gasoline engine would be quieter)
That's all folks...
http://alexonautos.com/cabin-noise/