Hi! I’m new to the C30 and so still in the “Kennerenlerphase”. Year of construction 2011 and mileage 31500. Recently I had my first long distance drive 2 x 400 km. The ABA was quite full so that often only Tempi was driven under 130 km/h in Kolonne. The radio was off and you had a pleasant conversation. I noticed the following: At speeds of 90 to about 120 km/h (most clearly at about 110 km/h) the loudest thing on the vehicle is not the engine (almost not to be heard) nor the tires or wind noise, but it was a funny rhytmic noise. When uncoupled it is immediately gone. It also doesn’t matter whether it’s 4s, 5s or 6s gear. The noise is almost the same. At Tempi from 120 km/h onwards take over other sounds, tires etc, the “first violin”. The noise is not extremely loud, but somehow, because it doesn’t matter exactly – but a “comish” Rhytmic noise is totally annoying, the idea is not the transmission?